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1.
Adj. Exceeding in excellence or good taste. Can be used to almost anything, from furniture to food. Composed of the word bum, meaning phat, and city, meaning a large area with a high population (Mainly focusing on the dense population part).
Person A: Lemme get at that pound cake!

Person B: I don't know if it's good or not.

Person A: If it's bad, I'll throw it out, but if it's bum city, I'll devour it.
by Geoffrey Ginger April 16, 2010
 
2.
another way to say "that's a bummer"
"Hey do you want to go to lunch today?"
"Oh, bum city...I already have plans!"
"Too bad...maybe tomorrow then."
by ErinR February 07, 2006
 
3.
A place, usually a place by a city filled with trees, where many bums live. People who go in usally get butt raped.
Guy 1: Luis wants to go to Bum city.

Guy 2: Why so he can get butt raped?

Guy 1: I don't know he's a dumbass.
by Chris G March 22, 2005