bum in WordNet English dictionary

1. 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?"
   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 
   
2. a disreputable vagrant
   "a homeless tramp"; "he tried to help the really down-and-out bums"
   tramp  hobo  bum 
   
3. 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'"
   rotter  dirty dog  rat  skunk  stinker  stinkpot  bum  puke  crumb  lowlife  scum bag  so-and-so  git 
   
4. person who does no work
   "a lazy bum"
   idler  loafer  do-nothing  layabout  bum 
   

1. be lazy or idle
   "Her son is just bumming around all day"
   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 
   
2. ask for and get free; be a parasite
   mooch  bum  cadge  grub  sponge 
   

1. of very poor quality; flimsy
   bum  cheap  cheesy  chintzy  crummy  punk  sleazy  tinny