Definition of "Bum" :

noun: the fleshy part of the human body that you sit on

noun: person who does no work

"A lazy bum."

noun: a person who is deemed to be despicable or contemptible

"Throw the bum out."

noun: a vagrant

"He tried to help the really down-and-out bums."

verb: ask for and get free; be a parasite

verb: be lazy or idle

"Her son is just bumming around all day."

adjective: of very poor quality; flimsy