Green’s Dictionary of Slang

tit n.3

also tit-end
[? tit n.1 (2) or tit n.2 (1)]

a fool; thus look an absolute tit, look a right tit, to appear a total fool, thus the school ‘witticism’, I feel a right tit.

[UK]Paul Pry (London 15 Aug. n.p.: George Hy, of Charlotte-street, alias the Sneak, alias the Spongy Cove, alias the Tit, and several others.
[UK]Sins of the Cities of the Plain 30: I asked her to kiss and forgive me. [...] ‘You know, Jack, I will. You were such a tit then,’ she replied.
[NZ]Landfall (N.Z.) Dec. 290: Why didn’t Lachlan go, the silly tit? [OED].
[UK]M. Frayn Towards the End of Morning (2000) 13: He’s such a tit.
[UK]K. Bonfiglioli Don’t Point That Thing at Me (1991) 44: Is your nark a little tit called Perce.
[UK]A. Bleasdale Scully 147: It was just one of them interviews on telly with someone famous. I kept looking for that tit-end, Robin Day, but he never showed.
[Aus]A. Weller Day of the Dog 110: The stupid old tit got stuck into the metho.
[UK]J. Sullivan ‘To Hull and Back’ Only Fools and Horses [TV script] We’ll have to get you something Hoskins, you look a right tit.
[UK]Indep. 28 Oct. 8: The Prime Minister is behaving like a complete tit.
[UK]Guardian Guide 29 July–4 Aug. 28: Talking shit and mooning about like the ten-gallon tits they are.

In phrases

big tit (n.)

(US) an important person, or one who thinks they are.

[US]J. Herndon Way It Spozed to Be (1970) 145: Someone had written ‘big tit’ on May’s page.
[US]J. Charyn Marilyn The Wild (2003) 85: Who’s the big tit here? Tell me the name of your rabbi.
stand there like a tit in a trance

said of one who is lost in thought, abstracted.

[UK]F. Norman Too Many Crooks Spoil the Caper 120: Well, don’t just stand there like a tit in a trance [...] Bust the door in.
[UK]Barltrop & Wolveridge Muvver Tongue 71: There was a waiter standing there like a tit in a trance.
tit about (v.) (also tissfatart about, tit around)

to play around, to waste time, to act in a trivial, pointless manner.

[UK]R. Llewellyn None But the Lonely Heart 66: It was funny about blokes as smoked pipes. Some of them just shoved baccy in anyhow, lit it [...] Other blokes tissfatarted about for hours, and never ever got the bleeding thing sucking proper.
[UK]K. Sampson Powder 142: There’s a big wide world for us out there, and we’re titting about in a panel-beater’s yard. [Ibid.] 374: All that tittin’ around just so’s David Geffen can see us play acoustic in the Serpent’s Tail?