cum, v. — Green’s Dictionary of Slang

cum v.

[often found, e.g. in written pornography, as an alternative to come v.¹; the sp. enhances the sexual aspect of the otherwise common word]

to achieve orgasm.

a.1961		‘Charlotte the Harlot’ in G. Logsdon Whorehouse Bells Were Ringing (1995) xviii: Way down on the prairie where cow plop is thick, / Where women are women and cowpokes cum quick.
1973		(con. 1940s–60s) Hogbotel & ffuckes ‘A More Vulgar Mind’ in Snatches and Lays 46: She taught that young man to ejaculate, / A more vulgar mind would say cum.
1989		Kirk & Madsen After The Ball 295: I’m going to cum.
1999		Guardian 24 July 21: Was this the inspiration behind her famous catch phrase ‘Cum up and see me sometime’?
2000		‘UK Snowy’ ‘Christmas Blackmail’ at www.asstr.org 🌐 ‘I think I‘ve just cum Ian,’ she murmured in a real time little girl voice. ‘But it was cool. Have you cum?’.