Bum

[Sarah]

1. A homeless person.
2. British/Australian equivalent of [butt].
3. To [fuck] someone up the [arse].

[Jessica]

To get something from someone else for free. Also used to borrow, but with the understanding that repayment might not happen.

[Rihanna]

Ass, butt, booty, gluteus maximus....

[Little_Girl]

Someone who does nothing all day and expects everyone to bend over backwards to please them.
Someone who has no liscense, no car, no job, no girl.

[Britney]

1. (n) (brit) your arse
2. (n) a homeless person/layabout
3. (v) to do someone up the arse, ie. perform anal sex on them
4. (v) (brit) to like something/someone very strongly
5. (a) (brit) fit, hot, sexy etc.

[Tina]

Anybody 24 years or older whos still jobless and living with his parents. See [loser].

[Couch Potatoe]

US/Canada

Pejorative for a homeless person, - especially one that makes no attempt to work or better himself (contrasted with the more respected working homeless “hobos”). Probably comes from the expression “lazy bums.”
Get a job you F’ing bum.

To shamelessly ask for something (in the manner of a bum – see above).
Dude can I bum a cigarette, five dollars, and a ride to the…

A loser with nothing going for him (no job, no aspirations etc). Especially an unworthy husband or boyfriend.
I can’t believe she’s with Jim. Always drinking, never workin, the guy is a bum.

UK/Commonwealth:
4. The more polite way of saying ass.
Does my bum look big in this?

To do in the bum.
I bummed a tart.

Afganistan
6. Bum is a major city in Afganistan.

[Rihanna]

A person who, by his own choice, is unemployed and homeless, and who lives on the fringes of society so he can beg instead of work.

Somebodys backside. A [keister].

[Sarah]

Has different meanings depending on where you go.

In America: A homeless person.
In the UK (and maybe some other countries too): Backside.