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Bumn is the swear version of bum (as in, ass). Just as damn is the swear version of dam. (Well, not really a 'swear,' but certainly not something you'd hear a child say!)

Unlike damn and dam, however, bumn DOES have the same meaning as bum.
Person A: "Goddammit! I have shit stains on my underwear again!"

Person B: "Well, if you'd just wipe your damn bumn better, you wouldn't have that problem, moron, now would you?"
by SexYes June 24, 2007

Words related to bumn

bum damn ass moron shit arse bitch goddammit