Green’s Dictionary of Slang

not worth a pinch of... phr.

(Can.) worthless, useless.

1979		Age (Melbourne) 1 Mar. 2/3: The Marijuana Party [...] ‘The only party worth a pinch of shit’.
1980		Barltrop & Wolveridge Muvver Tongue 41: ‘Not worth a pinch of cold shit’ means of no use to man or beast.
1992		D.L. Ouren Pope County Trib. 21 Sept. 🌐 A man often dismissed in popular Civil War histories (including the recent PBS series) as a swaggering braggart, a man ‘not worth a pinch of owl dung’.
1993		Smith & Noble Neddy (1998) 264: The two cops witnessed it formally to make it look good, but really, it wasn’t worth a pinch of shit.
1999		G. Seal Lingo 125: [Piss] may be applied in terms indicating contempt, such as you wouldn’t piss on him if he was on fire and not worth a pinch of piss or, more colourfully, not worth a pinch of cat’s piss.
2000		Paul port-sparc list NetBSD Mailing Lists 11 Dec. 🌐 PS remember the power on self test of RAM is not worth a pinch of bulldust.
2001		T. Greene Bad Date 35: These kids are made to feel their life’s not worth a pinch of coonshit .
2002		‘Frodo Baggins’ User Opinions on Read Plus CNET Download.com 25 Aug. 🌐 ‘Not worth a pinch of poop!’ It claims to be free but it isn’t free.
2003		Jennifer ‘Aus. Sl. Phrases’ Jennifer’s Jibberish 🌐 Not worth a pinch .......... worthless.
2012		(con. 1943) G.S. Manson Irish Fandango [ebook] ‘[Y]our evidence isn’t worth two knobs of goatshit’.