Green’s Dictionary of Slang

assfuck v.

also arse-fuck
[assfuck n.]

1. (orig. US) to have anal intercourse.

[US]G. Legman ‘Lang. of Homosexuality’ Appendix VII in Henry Sex Variants.
[US]Guild Dict. Homosexual Terms 2: ass-fuck (v.): To pedicate (fuck in the ass).
[US]L. Heinemann Close Quarters (1987) 191: She would do anything for a fiver [...] ass-fuck, titty-fuck, lick your asshole.
[US]W.D. Ehrhart Marking Time 66: Pam, that old boyfriend of yours — you suck him off [...] you even ass-fuck the guy!
Sick Puppy Comix (Sydney) #8 21: ‘You gotta write about sweet, tender little girlies getting arsefucked like cheap little whores!!’. [Internet] Rita Faltoyano is that type of chick and knowing that she loves Anal Sex just makes me want to ass fuck her every time I look at these pictures.
[Aus]P. Temple Truth 84: We don’t get smart here, we’ll know what arsefucked by a whole footy team feels like.
[UK]T. Black ‘Eat Shit’ in Killing Time in Las Vegas [ebook] Let me ass-fuck him, please [...] I ain’t gave no one a good ass-fucking for the longest time .
[US]D. Winslow The Force [ebook] ‘I’ll assfuck your widow on your coffin until she calls me Papi’.

2. in fig. use of sense 1, to humiliate.

[UK]J. Niven Kill Your Friends (2009) 14: A generic toff, the end product of a lineage of fine dining and arse-fucking the poor.