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.