When you put your dick between a girls butt cheeks and she wanks your cock using her butt.
That slut jessica gave me a bumwank last night it was good
by Jack_Bauer January 21, 2006
like a tit wank but with your arse
kristen didn't want full anal so offered a bum wank instead
by watermelonclitlicker May 31, 2010
Absolute spanner. A term used in frustration towards someone who has pissed you off.
"Oi, bumwank, what did you do that for?"
by Fairly Talented Thespian January 30, 2008
To wipe your arse crack over your victims nose in a forward and back motion. Thus leaving a shitty smell in their nose.
Eric was so annoying that Dave gave him a bum wank.
by Afcb stu October 07, 2006