Green’s Dictionary of Slang

not worth a shit phr.

also not worth shit, ...two shits
[shit n. (3g)]

worthless, useless; see also under worth a... phr.

[[US]q. in Wiley Life of Billy Yank (1952) 199: You ain’t worth a pinch of shit].
[UK]G. Lamming Emigrants (1980) 65: You get dis thing an’ den you find out [...] it ain’t worth two shits.
[US]Kerouac letter 2 Jan. in Charters I (1995) 483: Now that I know the truth and that it isnt worth a shit whats the difference whether I do or dont?
[US]S. Yurick Warriors (1966) 99: None of them could control their women one shit-worth.
[US]J. Wambaugh Choirboys (1976) 42: It’s your life. If it ain’t worth a shit to you, it ain’t worth a shit to us.
[US]J. Webb Fields of Fire (1980) 21: Why the hell would he be in a movie in the afternoon if he’s worth a shit.
[US]J.L. Gwaltney Drylongso 234: A lot of these black ones ain’ worth shit, either.
[US]G.V. Higgins Patriot Game (1985) 203: Only one of those kids worth shit and he enlists in the fuckin’ army [...] and gets shot down over Vietnam.
[Can]Totally True Diaries of an Eighties Roller Queen [Internet] 4 July We waited one hour to get on the Grand Canyon ride and found out it wasn’t worth two shits.
[Ire]B. Quinn Smokey Hollow 26: Dommo, you’re not worth a shit.
[UK]M. Collins Keepers of Truth 8: How my college degree wasn’t worth shit.