Green’s Dictionary of Slang

an all-purpose, otherwise meaningless term, used rhetorically at the end of sentences.

c.1940s–50s		Max Miller in Took Max Miller Blue Book (1975) n.p.: I’ve only had two sweethearts in me life – two – it’s enough, innit?
1962		H. Livings Nil Carborundum (1963) Act III: Just listen to them rifles clicking. Sinister innit?
1971		L. Sanders Pleasures of Helen 243: Cock, cunt and the grave. That’s about it—innit?
1981		T. Wilkinson Down and Out 175: It’s a bit late to complain about last night innit?
1982		L. Cody Bad Company 58: Look, that’s my affair, ennit?
1989		M. Amis London Fields 54: Be on television, a face known by millions. On TV innit. TV.
1999		(con. 1979–80) A. Wheatle Brixton Rock (2004) 25: You’re very bitter, innit.
2000		N. Barlay Crumple Zone 4: ‘Burston [...] you wouldn’t know the difference.’ — ‘Needa would you innit.’.
2009		J. Joso Soothing Music for Stray Cats 77: He’s well cool man init.
2011		S. Kelman Pigeon English 39: We’ll look out for you, innit.
2014		Spectator 4 Oct. 12/1: He was inappropriately trying to pull a bird, innit.
2020		G. Krauze What They Was 128: Do your ting innit, man’s just tryna help you.