To lend someone something.
To give someone something, with the idea they will at one point do it for you in return.
Hey, bum me a cig.
Bum me some gum.
by Strands57 December 19, 2006

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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

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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

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A person that lives on the streets smells like ass runs at your car while you are stoped at a red light baggin on your window got any change? or they run up and half ass clean the windshild with a squgee and muddy water makein a mess of your car. They sit around with signs sayin will work for food while drinkin mad dog or boones farm they never make any sence when they talk and they always call you buddy. They sleep in boxs,dumpsters,park benchs with a paper over their face. They crap in allyways,gas stations,your sidewalks,the street and hardly ever wipe their ass.
That fuckin bum just splashed muddy water all over my clean window.
by tube666 November 21, 2006

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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

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A boxing term used to label easily-beaten and out-of-shape/unskilled/past-their-prime boxers who should never have stepped into the ring to face stronger competition.
He couldn't last a full first round against real professional boxers like Sugar Ray Leonard and Marvin Hagler and Thomas Hearns. Instead, his victories only came against a series of aging bums, each of whom were sent into the ring after being paid a few bucks by unscrupulous boxing promoters.
by Joe Bloggs II August 19, 2012

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1.Someone who is a bum is known as a homeless, crackhead, or just a person who dresses ugly and walks on streets being lonely- alot of people use it to dis people.

2.Another version of bum used a lot in the area of Virginia it means sexy, cute, or good
1.Chick you ain't nothing but a bum.
*She be walking around school like she a bum ever since they broke up.
*Man I'm broke I just gave that bum my last 5.

2.Damn that shorty is bum.
*Oh my god girl he is so bum.
*Damn ma this chicken is so bum.

after all of that u should know the definition of bum and u should be tired of the word bum cuz i know i am
by Karrey August 16, 2007

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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

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