Leftover fecal after a partial toilet flush.
Fecal left in a toilet for the purpose of grossing out the next user, generally in a public facility or done due to lack of home training.
"That nasty bastard chummed the toilet"

"Nothing worse than walking into the bathroom and seeing toilet chum!"
by Joe Max May 23, 2010
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Being shot at, or being hit with something.
by idiota December 9, 2003
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When one inserts a chunk of toffee into their buttocks and bends over while an acquaintance licks it out.
"Excuse me sir, would you care for a spot of chumming?"
by Georgeyboy1 February 13, 2008
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A close friend who occasionally makes you cum.
Q - What's going on with you and your bestie ?

A - We'll always be chums
by Long&Hard October 30, 2016
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An awesome friend. Someone you can make fun of without them pulling out your hair. Preferably someone who goes out of their way to fix your life. If you don't have a chum, your life friggin sucks.

P.S. chum is also dog food :P
"Make me an offer I can't refuse, chum."
"Lit, chum. Real lit."

You: "Ellie will never like me!"
Chum: "HEY ELLIE!"
You: "Wtf are you doing?!"
Chum: "Ellie, look into my eyes and tell me you don't like my friend."
Ellie: "Why would I do that?"
Chum: "'Cuz you can go out with him."
Ellie: "I'll think about it"
by Cade the Food King January 11, 2017
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Friends that you've known over 5 years and can talk about literally anything even when you guys live far away.
Yeah, that's my chum, they've been there since day one.
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