What is the meaning of bum?

noun

• A person who is deemed to be despicable or contemptible.
  • usage: "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'"
  • synonyms: rotter, dirty dog, rat, skunk, stinker, stinkpot, puke, crumb, lowlife, scum bag, so-and-so, git
• A disreputable vagrant.
  • usage: "a homeless tramp"; "he tried to help the really down-and-out bums"
  • synonyms: tramp, hobo
• Person who does no work.
  • usage: "a lazy bum"
  • synonyms: idler, loafer, do-nothing, layabout
• The fleshy part of the human body that you sit on.
  • usage: "he deserves a good kick in the butt"; "are you going to sit on your fanny and do nothing"
  • synonyms: buttocks, nates, arse, butt, backside, 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

verb

• Ask for and get free; be a parasite.
  • synonyms: mooch, cadge, grub, sponge
• Be lazy or idle.
  • usage: "Her son is just bumming around all day"
  • synonyms: bum around, bum about, arse around, arse about, fuck off, loaf, frig around, waste one's time, lounge around, loll, loll around, lounge about

adjective

• Of very poor quality; flimsy.
  • synonyms: cheap, cheesy, chintzy, crummy, punk, sleazy, tinny