Nouns

(n)rotter, dirty dog, rat, skunk, stinker, stinkpot, bum, puke, crumb, lowlife, scumbag, so-and-so, git, scum baga 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’”
(n)tramp, hobo, buma vagrant“a homeless tramp”, “he tried to help the really down-and-out bums”
(n)idler, loafer, do-nothing, layabout, bumperson who does no work“a lazy bum”
(n)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, assthe 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?”

Verbs

(v)mooch, bum, cadge, grub, spongeask for and get free; be a parasite

Adjectives

(s)bum, cheap, cheesy, chintzy, crummy, punk, sleazy, tinnyof very poor quality; flimsy