Bum Chum

Bum Chum is frequently used when you're angry and don't want to swear however i don't recommend saying it around school or your parents. That was the slang version, heres the actual definition of a Bum Chum, an actual Bum Chum means a crumb / chum that falls out of your buttocks after you urinate or poop.

"Oh Bum Chum!" said Dave as he accidentally dropped a hammer on his toe.

"Oh, i just dropped one of my Bum Chums!'' explained the man that just had a poop.