Green’s Dictionary of Slang

1. a blow.

1821

Egan Life in London (1869) 294: She tipp’d him a volloper right across the snout.

2. anyone who beats up their victims with a cudgel or stick.

1877		J. Greenwood Dick Temple II 114: Too much of a walloper, she is [...] and a starver.
1904		Sun. Times (Perth) 3 Jan. 5/2: [headline] Hot Stuff for Horse Wallopers.
1937		P. Cheyney Dames Don’t Care (1960) 163: A big, cheap walloper with nothin’ but some muscles an’ a gun.

3. (US) anything or anyone exceptional in quality, size, character etc.

1896		G.F. Northall Warwickshire Word-Book 259: Walloper. Anything huge of its kind.
1917		Queenslander (Brisbane) 28 July 45/3: Ho, I expect it will be a walloper.
1931		Boy’s Life Feb. 3: Lieutenant Strong has done a walloper: ‘Neptune Meets the Whale.’ A story of water polo that’ll make you want to get the old swimming suit to work again.
1939		W. Winchell On Broadway 11 Dec. [synd. col.] S. Halloway’s ‘recital’ was a walloper.

4. a cudgel; a cane.

1837		Chambers Edin. Jrnl 16 Dec. 369/2: I had a great mind to give him a clip then, but didn’t like to do it with such a walloper, so I makes a kick at him.
1871		J. Barrington Personal Sketches 2 417: It was himself who had cracked the skull of Ned Cahill at the fair of Dysart, with a walloper.
1900		Marvel XIV:343 June 15: The master got handy with his whangee walloper.

5. one who beats, e.g. hitting a child.

1903		Sun. Times (Perth) 29 Nov. 10/3: [headline] Brought to Book. A Wife-Walloper.
1906		Warwick Examiner & Times (St Lucia, Qld) 16 May 8/2: The champion female walloper of the world is Miss Heston, a school madam in Ohio.
1913–14		Van Loan ‘No Business’ in Taking the Count 151: He’s the roughest walloper in seven counties.
1992		K. Lette Llama Parlour 232: He wasn’t a walloper, my dad. If I threw a tantrum or something, he’d just start singing the anthem.

6. in fig. use of sense 1.

1944		Billboard 11 Mar. 17: This season has been a walloper for lay-offs via grippe, flu and pneumonia, not to speak of a variety of twists and sprains,.
2004		A.J. Rathbun Party Drinks 27: The Long Island Iced Tea is a walloper. Be careful when drinking, as its friendly taste disguises its potency.

7. (Aus./N.Z. milit.) a worker, e.g. base walloper, a clerk; security walloper, a guard [influenced by wallah n.].

1918		L.N. Smith Lingo of No Man’s Land 66: POULTICE WALLOPERS Hospital orderlies.
1923		P. MacGill Moleskin Joe 63: Come on, you uncircumcized poultice-faced muck-wallopers and grease to’t!
1930		Western Mail (Perth) 26 June 2/4: I fancy he served with the A.A.M.C. — ‘poultice-walloper’.
1933		(con. WWI) A.E. Strong in Partridge Sl. Today and Yesterday 287: He is a shrewd head, but I think he would give a man a fair go although he is a base-walloper.
1947		D. Davin For the Rest of Our Lives 147: Almost makes a man want to be a base walloper.
1959		(con. 1940s) G. Slatter Gun in My Hand 154: I soon wangled my way to platoon headquarters as platoon runner. Bloody base walloper the others said but they didn’t mean it.
1967		S. Hugill Sailortown 4: Working down hatches, chipping the side , and so on — duties [...] only suitable to longshoremen and cargo wallopers.
1977		(con. 1941) R. Beilby Gunner 117: A corpulent A.S.C. captain was seated on a rock, one boot off, examining a blistered heel [...] A base walloper, Gunner surmised, from one of those support units that seldom marched.
1979		(con. 1940s) G. Stewart Leveller 91: ‘Bob, for Christ’s sake, Green’s a security walloper,’ I gee’d.
1988		McGill Dict. of Kiwi Sl. 13/2: base walloper Kiwi version of a base wallah, or military pen pusher; ‘wallah’, Hindi ‘wala’, connected with, was habitually added on to functions to suggest functionary in Anglo-Indian army; here refined by pun on base as bum.
2003		McGill Reed Dict. of N.Z. Sl. [as cit. 1988].

8. (Aus.) a police officer; cite 1909 refers to a fireman.

1904		Sun. Times (Perth) 26 June 9/6: Wellington-st. Walloper. All those who walk down Wellington-street / This uniformed person will meet.
1909		Sun. Times (Perth) 21 Feb. 3s/4: Valiant Flame-Walloper [...] an indignant fire-walloper rushed in.
c.1936		‘The Dying Bagman’ in Seal Lingo (1999) 96: Where the demons and wallopers can’t worry me, / In the shade where the old rattler blows.
1945		Baker Aus. Lang. 137: We also call a policeman a rat [...] and a walloper.
1950		F.J. Hardy Power Without Glory 33: Police! Everyone out! The bloody wallopers are on their way!
1960		‘Nino Culotta’ Cop This Lot 79: Wallopers in front [...] Looks like the border.
1968		A. Buzo Norm and Ahmed (1973) 20: Go easy on the old wallopers, that’s what I say, give the coppers a fair go.
1978		J Hepworth His Book 164: Apart from sharing the nationwide constabulary sensitivity to being called ‘mug coppers’ or ‘wallopers’, the Canberra fuzz are particularly touchy about two things.
1985		R.G. Barrett You Wouldn’t Be Dead for Quids (1989) 155: Eight of the biggest Queensland wallopers you’d ever wish to see burst through the doors.
1992		R.G. Barrett Davo’s Little Something 37: The wallopers have been round with a warrant [...] for parking fines.
1997		J. Birmingham Tasmanian Babes Fiasco (1998) 211: The wallopers were in the living room, which was a bit nasty.
2000		R.G. Barrett Leaving Bondi (2013) [ebook] After unexpectedly seeing the wallopers, Les felt like something soothing.
2008		B. Lovell Fugitive on the Run 344: If you get lost, you can always turn to a walloper for help.
2012		(con. 1943) G.S. Manson Coorparoo Blues [ebook] The Yanks didn’t call the local wallopers.
2020		D. Whish-Wilson Shore Leave 117: ‘More than subtle intimidation was called for, young lady [...] Why I called an ex-walloper’.

9. (also wolloper) a clumsy fellow.

1943		W. Guthrie Bound for Glory (1969) 405: Walk careful! Don’t hafta waste my time fishin’ no land wallopers outa this slimy warsh!
1987		W.T. Vollmann You Bright and Risen Angels (1988) 78: The lazy damned wollopers.

10. (Aus.) the penis.

1970		San Diego Sailor 58: He came back with [...] his walloper like a rod out in front of him.
1985		B. Humphries Traveller’s Tool 8: They’re that desperate for the white man’s walloper over there.
1991		B. Hamper Rivethead (1992) 203: Mel brandished his walloper as Kate’s ample melons glistened in the piss-colored haze.

11. (N.Z.) a masturbator.

2003

McGill Reed Dict. of N.Z. Sl.

12. see wallop v. (7)