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.

Bum Chum

When a person on a boat has held in their fecal matter for too long and has no other option than to release their excrement over the side of said boat.

Jim, look at Steve, he just made bum chum off the side of your boat!