Green’s Dictionary of Slang

1. a reverberating blow.

1772		Bridges Burlesque Homer (3rd edn) 7: Then whang / His bowstring rattl’d with a twang.
1888		C.D. Warner Their Pilgrimage (2004) 91: [It] is not always covered and subdued into a harmonious whole by the whang of the bass drum.
a.1889		Browning Up at a Villa n.p.: Bang, whang, whang, goes the drum [F&H].
1904		G.M. Hewett Rat 4: And then ‘whang comes something’ – half a brick or a great stick.
1920		H. Wiley Wildcat 207: Whang! A quick swing with a loaded club tamed the military Wildcat considerably.
1920		Sydney Sportsman (Surry Hills, NSW ) 7 Jan. 7/3: Looking for little holes [...] to whack a deadly whang into the belly.
1930		(con. 1900s–10s) Dos Passos 42nd Parallel in USA (1966) 213: There were the sharp whang of the golf balls and the flutter of bright dresses on lawn.

2. (Aus.) a large piece, a share, a portion.

1834		Three Years Practical Experience of a Settler in NSW in Sydney Monitor 14 Nov. 1838 2/4: I then pull out my pocket knife, draw a damper (bread), cut off a whang, and put a bit of beef on it.
1871		Adelaide Obs. 11 Aug. 3/4: All the carters coming in with hay and straw and roots and vegetables stopped for their cup of tea and coffee and their big whang of bread.
1941		Baker Popular Dict. Aus. Sl.

3. (US, also whangdanger) an excellent thing; also as adj.

1932		J. Dixon Free To Love 184: Graber’s given me a whang of an idea for a yarn.
1943		W. Guthrie Bound for Glory (1969) 400: ‘What th’ hell you doin?’ he said back in the crowd. ‘Runnin’ f’r office with that whang-danger music box?’.

4. (orig. US) the penis, usu. large [the aggressive image of the penis as that which ‘hits’ the vagina].

1934		in Randolph & Legman Ozark Folksongs and Folklore (1992) I 496: When the Lord made father Adam, / They say he laughed and sang, / He sewed him up the belly / With a little piece of whang. [...] Said he, ’Tis but eight inches, / So I’ll just let it hang, / And he left on Adam’s belly / That little piece of whang.
1941		in G. Legman Limerick (1953) 5: A lady while dining at Crewe / Found an elephant’s whang in her stew.
1948		in Randolph & Legman Ozark Folksongs and Folklore (1992) II 655: His whang hung down below his knees.
1959		M. Richler Apprenticeship of Duddy Kravitz (1964) 60: He’s got a whang that could choke a horse.
1959		‘Count Palmiro Vicarion’ Limericks 106: It would be diverting / To see him inserting / His whang.
1969		‘Iceberg Slim’ Mama Black Widow 108: He poked his gigantic whang into her.
1970		T. Southern Blue Movie (1974) 179: Holy Christ [...] look at the whang on that coon!
1981		J. Wambaugh Glitter Dome (1982) 267: I got a limber whang, Wing! I don’t get straight I might as well become a priest!
1998		‘Bill E. Goodhead’ Nubile Treat 🌐 She longed to know what his whang looked like, especially after his voice deepened and he matured.
2021		J. Ellroy Widespread Panic 233: They whipped out their whangs and pissed in the street.