Green’s Dictionary of Slang

an abusive epithet.

1958		N. Mailer letter 20 Mar. in Selected Letters (2014) 238: I kept telling myself [...] that you weren’t a shithead snob like all the others.
1968		Oz 8 40/3: Johnson and his shithead aides are murderous bullies.
1973		Tharunka (Sydney) 8 Nov. 27/2: ‘You shithead good for fuck-all-illiterate-prick’.
1982		G.V. Higgins Patriot Game (1985) 225: It ain’t funny, shithead darling brother.
1986		C. Hiaasen Tourist Season (1987) 262: That crazy-cretinous-brainless-shitheaded putz of a Cuban.
1986		R. Fitzgerald Pushed from the Wings (1989) 41: You’re the shit-head commentator who said my carer was over.
1987		W.T. Vollmann You Bright and Risen Angels (1988) 240: You shithead deck swabber.
1987		(con. 1968) Bunch & Cole Reckoning for Kings (1989) 301: That shithead major didn’t ask me if I wanted to come along.
2005		P. Temple Broken Shore (2007) [ebook] The smartarses who walk [...] Outside, it’s the high fives. How easy was that. Fucking shithead cops, let’s do it again.
2022		I. Fitzgerald Dirtbag, Massachusetts 70: [I]ncredibly fancy apartment [...] that goes completely unused 99 percent of the time so that rich shithead kids can trash it.