To sodomize; to engage in anal sex.
To ask someone to give one (something) for free; to beg for something.
Can I bum a cigarette off you?
To stay idle and unproductive, like a hobo or vagabond; to loiter.
I think I'll just bum around downtown for awhile until dinner.
To wet the end of a marijuana cigarette (spliff).
To depress; to make unhappy.
To make a murmuring or humming sound.