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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To get spit over the end of a ciggaret, joint etc and make it wet. Often a classic for people who smoke to be cool rather than the actual pleasure or it.
"hey man, you have totally bummed this spliff"
by Dark Immortal November 5, 2007
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when you bum something it means you have a passion for it
by Charli April 21, 2004
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Really sad British slang that the British use every time they try to define arse.
What's really sad about bum is that if only the British would say ass when they mean ass, instead of mispronouncing arse, they wouldn't need to define arse, and wouldn't feel compelled to say bum.
by Fly On The Wall January 3, 2005
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A cat who can't play no ball!

Unathletic. No talent having mofo.
Don't pick that cat! That dude a bum!!
by reggie December 16, 2004
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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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