From WordNet (r) 3.0 (2006):
bum adj 1: of very poor quality; flimsy [syn: bum, cheap, cheesy, chintzy, crummy, punk, sleazy, tinny] n 1: a person who is deemed to be despicable or contemptible; "only a rotter would do that"; "kill the rat"; "throw the bum out"; "you cowardly little pukes!"; "the British call a contemptible person a `git'" [syn: rotter, dirty dog, rat, skunk, stinker, stinkpot, bum, puke, crumb, lowlife, scum bag, so-and-so, git] 2: a disreputable vagrant; "a homeless tramp"; "he tried to help the really down-and-out bums" [syn: tramp, hobo, bum] 3: person who does no work; "a lazy bum" [syn: idler, loafer, do-nothing, layabout, bum] 4: the fleshy part of the human body that you sit on; "he deserves a good kick in the butt"; "are you going to sit on your fanny and do nothing?" [syn: buttocks, nates, arse, butt, backside, bum, buns, can, fundament, hindquarters, hind end, keister, posterior, prat, rear, rear end, rump, stern, seat, tail, tail end, tooshie, tush, bottom, behind, derriere, fanny, ass] v 1: ask for and get free; be a parasite [syn: mooch, bum, cadge, grub, sponge] 2: be lazy or idle; "Her son is just bumming around all day" [syn: bum, bum around, bum about, arse around, arse about, fuck off, loaf, frig around, waste one's time, lounge around, loll, loll around, lounge about]