kotac

1. pigsty; pigpen
   Deda je očistio kotac iza kuće. — Grandpa cleaned out the pigsty behind the house.
2. colloq. dated (of a filthy room) pigsty; dump
   Tvoja soba je pravi kotac! — Your room is a real pigsty!

A rare, mostly rural word. In the literal sense Serbians usually say svinjac; in the figurative sense ('filthy place') kotac is hardly used today — use svinjac instead (pravi svinjac).