Green’s Dictionary of Slang

1. an act of defecation.

a.1945		L. Payne private coll. n.p.: — Tom Tit.
1953		J. Franklyn Cockney 292: Now you can ’old up [...] a bit, mate, while I go for a tomtit.
1969		S.T. Kendall Up the Frog.
1979		R. Barker Fletcher’s Book of Rhy. Sl. 43: I’d just been into the bog for a Tom Tit.
1983		J. Byrell (con. 1959) Up the Cross 29: ‘That must’ve been a long tom tit. Bet you had to use a full roll of whatnot wiper’.
1998		B. Robinson Peculiar Memories of Thomas Penman 8: Tom = Shit (Tom Tit/Shit).
2000		Observer Screen 5 Mar. 9: Who’s used all the paper? I’m halfway through a tom tit ’ere!
2003		B. Dark Dirty Cockney Rhy. Sl.

2. a piece of excrement.

1943		R. Llewellyn None But the Lonely Heart 116: You’re always doing it, you shower of tom tit, you.
1977		R. Coover Public Burning (1979) 138: He will make truth to shine forth, meanin’ me, bringin’ doom down upon the Sons of Darkness like a tom-tit on a horse-turd!
1999		Roger’s Profanisaurus 3 in Viz 98 Oct. 6: brown lilo n. A buoyant Tom Tit that, left alone, will eventually make its way out to sea.

3. (Aus.) unpleasant, violent treatment.

1983

J. Byrell (con. 1959) Up the Cross 9: ‘He sprung a few bikie mugs dishin’ out of heap of tom to one of the dead horse charlies’.

4. a contemptible person.

1966

P. Boyle At Night All Cats Are Grey 98: At the thought of that disreputable tomtit – never a creature of fixed abode – coiled up [...] in a corner of the graveyard.