Green’s Dictionary of Slang

third-rate, nondescript.

1981		Easyriders Oct. 47: Cut loose some of those bumfuck, hardluck losers [HDAS].
1983		Eble Campus Sl. Nov.
1995		L. Stavsky et al. A2Z 14: bumfuck – worthless: I’m trashing this bumfuck turnstile.
2000		C. Cook Robbers (2001) 4: Outsiders from the rural frontier, from the forgotten and unseen bumfuck outskirts of the urban media landscape.
2004		J. Vogel Flim-flam Man 145: Our only comfort was a nice bag of pot, which [...] was stolen during a bathroom break in a bumfuck town in eastern Washington.
2013		M.S. Crosswell ‘Cinders’ in ThugLit Aug. [ebook] ‘I'll have everybody in this bumfuck town out at that lake’.
2016		Guardian 27 June 🌐 It’s Corbyn who prompts mass resignations because he isn’t single-handedly able to cure ignorance in bumfuck parts of England.
2023		(con. 1962) J. Ellroy Enchanters 76: [A] bumfuck coktail lounge up in bumfuck Van Nuys.