Penis bum bum is used to describe someone who is both a dickhead and/or ass hole, penis bum bum sounds far less offensive then both of these but means a great deal more.
"Omg stop annoying me!"
"No it's funny"
"GOD you're such a penis bum bum!"
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Any flying insect which can be found hanging around the anus of cattle / sheep and / or welshmen.
Have been known to descend to feast upon shite from said critters arses.
Look at the way the bum bum fly just hangs there...
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A cute, sweet girl that is simultaneously singing and dancing with a child-like smile on her face
That girl over there listening to the Gypsy Kings is such a bum bum hunny!
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(verb) To let someone borrow, and if necessary keep without repayment.
I told him I could bum him a spare keyboard, but he ended up stealing the one from the store anyway!
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The old-school fifties gangster version of ass hat
And the non-mexican version of rectal sombrero
Can be used as a comeback and/or insult
See also ass hat, and rectal sombrero, also created by Lauren.
Lauren: WOW Julia you stupid
Julia: BUM BUM FEDORA!! oooo take that.
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When someone really loves a certain thing. So much to the extent of it being annoying to others
"Hey you know that dave he really bums Slayer!"
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To sodomise a human, animal or object (not including trees) not illegal if the other gives their consent
Shut up Laura, or I will Bum You, And Tom won't stop me
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