(chiefly Canada, US, slang, idiomatic) Forcible ejection of someone, such as a bum (hobo), from an establishment.

plural of bum bag

(chiefly Britain, slang) Someone or something very annoying.

(idiomatic) Bad advice or information, regardless of intention.

(chiefly UK, New Zealand, slang) The top of the buttocks exposed when trousers are worn too low, or when the wearer bends over.

(slang) The space between the buttocks.

(UK, derogatory slang) A male homosexual's partner; a male homosexual.

(slang) Depressed, disappointed, in a gloomy mood.

simple past tense and past participle of bum out

(literally) With one's bottom exposed, as for a spanking or a mooning. / (by extension) Stark naked.