noun

• (informal) A decrepit motor car.
  "The only rig nobody'd recognize is that clunker that Vic drove here in, and he won't take it."
• (informal) Anything which is in poor condition or of poor quality.
  "It seemed silly for the crowd to applaud or groan over what you had already felt in your fingers or even in your arms as you braced to shoot or for that matter in your eyes: when he was hot he could see the separate threads wound into the strings looping the hoop. Yet at the start of the game when you came out for warm-up and could see all the town clunkers sitting in the back of the bleachers elbowing each other and the cheerleaders wisecracking with the racier male teachers, the crowd then seemed right inside you, your liver and lungs and stomach."