Green’s Dictionary of Slang

shagger n.1

[shag v.1 ]

1. one who copulates; a sexual enthusiast.

[UK](con. WWII) B. Aldiss Soldier Erect 12: Now there was a born shagger [...] given the chance.
[UK]W. Boyd ‘Hardly Ever’ On the Yankee Station (1982) 48: ‘Shagger,’ Panton accused. ‘Bloody old shagger, Quent.’.
[UK]Guardian G2 1 Oct. 8: The character – a serial shagger – had taken over the quiet and faithful member of Equity.
[UK]K. Sampson Outlaws (ms.) 160: Could be kids and that. Could be shaggers. Could be any cunt.
[UK]Times Review 30 Apr. 5/5: West had enjoyed a very vigorous relationship with H.G. Wells, the great shagger of English literature.
[UK]I. Welsh Decent Ride 66: Eh’s goat that glint in ehs eye that aw shaggers huv.

2. a nuisance, a lazy, disobedient person.

[UK]J. McClure Snake 57: ‘Work to be done,’ the foreman said [...] ‘Come on you good-for-nothing ntombi shaggers, get up those ladders.’.
[Ire]P. Boland Tales from a City Farmyard 171: I grabbed my sheets, brown wrapping paper and twine, and ran out to the landing, calling them a crowd of shaggers.

3. any thing or person.

[Ire]H. Leonard Da (1981) Act II: I only grow the shaggers.
[Ire]T. Delaney Where We Sported and Played 62: My maths exercise copy book that some shagger stole on the way to school.
[Aus]N. Cummins Tales of the Honey Badger [ebook] Not a day goes past when some shagger won’t ask me where my nickname hails from.

In compounds

shagger’s back (n.)

(orig. Aus.) a particularly painful backache, supposedly the result of over-enthusiastic copulation.

[Aus]Age (Melbourne) 17 Sept. 150/1: When malcolm Frazer had his poor bad back [...] the viulgar thought welled up from our collective subconscious [...] (nudge, nudge) ‘shagger’s back’.
[NZ]McGill Dict. of Kiwi Sl. 98/2: shagger’s back a sore back from excessive shagging or sexual intercourse or boasting that one has, to suggest sexual virility.
Brisbane Hash House Harriers Run Report 19 Apr. [Internet] On the bush tracks PUBIC was going at a cracking pace for someone recovering from cronic [sic] shagger’s back.
(ref. to 1996) Turramurra Trotters Home Page (Aus.) [Internet] The ‘Best Excuse for a Poor Performance Award’ is held by Col Sutton, who complained of ‘shagger’s back’ on two consecutive Saturdays in 1996 .... we were going to ask Mrs. Sutton for a second opinion, but Col advised against this.
[NZ]McGill Reed Dict. of N.Z. Sl. [as cit. 1988].