to borrow something from someone;

a homeless person;

the butt
chick 1: "hey can i bum a smoke off you?"
/
dude 1: "hey look at that bum! he's all like, poor, an' shit."
chick 1: "not .cool."
/
chick 1: "man, i ate shit yesterday on my board and broke my bum."
by love-bruises March 06, 2007
The verb 'to bum' is used to describe the act of either, sucking up to, following or loving somebody or something.
'Did you see Jason in class today? He's such a teacher's pet he totally loves to bum Mr Matthews, its sick.'

'Oh em gee sarah was totally bumming Emily alll yesterday! They were stuck to each other like glue and i mean woah they arn't even bffs!'

Sally: I bum you!
Melanie: I bum you too!

Elle: I BUM ZAC EFRON!
by HmmfCreator June 04, 2009
to not work, or its useless.

why doesn't that woman have any kids?
oh, she's git a bum ovary.
by realforlife April 21, 2008
What insecure teenagers and adults call normal people in an effort to bring them down to their level.
Joe is so nice and smart. I am not nice and smart like Joe. I am jealous. I wish I could be nice and smart too. I will tell my friends he is a bum.
by dm400 November 28, 2005
The guy living in my shed. Mooches food and booze and breaks into neighboring houses for more booze.
Neighbor: Hey man, how long has that Bum been living in your shed?

Me: Three Months

Neighbor: He smells. Get rid of him.
by The400Runner November 06, 2011
A homeless person with no job, no dignity, and collects trash. Mostly known as a "johnathan" or "clayton".
Asshole 1:"Look at that bum...I'm glad my name isn't johnathan".
by S1@Y3R September 06, 2008
A thing you have to jump over on a skateboard.
I just jumped a bum.
by austintheoneguy May 12, 2007

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