Green’s Dictionary of Slang

1. some form of suckable sweetmeat.

1866		Birmingham Dly Gaz. 1 Jan. 6/1: Here a very remarkable old woman used to live. She sold sucks and sweets and children were delighted to spend their money there.
1900		Sporting Times 2 June 1/3: Which’ll ye ’ave: a ’aporth o’ suck or a little flag?
1959		I. & P. Opie Lore and Lang. of Schoolchildren (1977) 186: Sweets are referred to as [...] ‘sucks’ or ‘suckers’.
2003		Brummagem Dict. 🌐 sucks npl. children’s sweets.

2. the act of fellatio or cunnilingus.

1870		Cythera’s Hymnal 78: And i think that a fuck / Ain’t as good as a suck.
1873		Romance of Lust (1996) 143: I proposed we should have a mutual suck on the floor, with her bottom to the light, that I might have a full view of all her glorious parts.
1881		Sins of Cities of Plain 28: Of course other nights we changed places and partners, sometimes going in for a general suck all round and giving our bottoms a rest.
1884		‘Experiences of a Cunt Philosopher’ in Randiana 71: Drawing back my foreskin she tongued me with a sweet solacing suck.
1941		in G. Legman Limerick (1953) 204: A buck for a fuck, / Fifty cents for a suck, / And a dime for a feel of her fanny.
1968		J. Hersey Algiers Motel Incident 101: The whore’ll say, ‘A suck and a fuck for fifteen dollars.’.
1970		T. Southern Blue Movie (1974) 14: Teeny Marie cavorted on the periphery of the small group, repeating her frantic suck-simulation and grimacing madly.
1974		Searchlight (Sydney) lxxxiv 18: [advert] 30-year-old man would like the company of very thin bird for cunnilingus and fellatio sessions. Must be extremely thin and flat-chested or small boobed. Intercourse maybe, but suck the main scene.
1981		S. Berkoff Decadence in Decadence and Other Plays (1985) 11: les: Take your knickers off I wanna fuck / sybil: Tell you the truth / I’d rather have a suck.
1984		B. Ellem Doing Time app. C 218: That’s where the homosexuality starts from. Some will rip a boy into the shithouse and get up him or get a suck off him.
1993		R. Shell Iced 71: I invited her up for a double S (smoke and suck).
2007		D. McDonald Luck in the Greater West (2008) 112: – We can’t fuck youse though. – Just a suck, baby.