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A good friend that's dirt poor and/or cheap. Also, they are extremely lazy, and won't go out or do much but play video games and surf the internet.
He's a great friend but we never chill cause he's just a chum bum.
by SuperMookER March 04, 2010
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Someone who you think is great and who thinks you're great too. Comes from the word bumming which does not always mean the act of Anal Love Making but liking a person a lot. E.g "You're ALWAYS bumming her!"

Chumbums are people you bum (in the context as above) and who bum you!!
Person 1:"Hey Chumbum"
Person 2:"Haha! Hey what you been up to?"
Person 1:"Nothing much!"
Person 2:"Wanna come over my house"
Person 1:"Sure"
Person 3:"You two stop bumming eachother!!"
by Dan.R March 07, 2006
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