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1.
Someone with a gaping arse hole.

As with the word wizards sleeve but slightly larger in size.
"Steve, I was watching a pr0n0 last night, you wouldn't have believed the size of the bumhatch on this bird!"

Or........

"I bet she has a bumhatch and a half!"
by Andy and Dave July 20, 2006

Words related to bumhatch

bum bum hartch bumm hatch hatch