A sense of humor that tailors specifically to childish and immature words, often said without any real reason, that is adopted mainly by young children, but can be found with young teenagers as well as few adults
Person 1: stinky willy
Person 2: EHEHEHEHEHHEHEHEHEHEHEHEHHEHEHEHEHEHEHE
Person 1: you have such a poopie bum bum sense of humor
Person 2: yup
by Bottt_urban January 19, 2021
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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!"
by Stoner.Babe98 April 25, 2017
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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...
by urbankhaos May 6, 2003
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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!
by Ringo Stein May 28, 2008
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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.
by Julia&Lauren February 2, 2006
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Spread their cheeks and diaper your secrets into it before ejaculating into it
by Moe Lester6969bomber February 19, 2022
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