klunker

noun6

1. •
   (US) A beat-up, unreliable car.
2. •
   (US) An old, slow, or decrepit computer; a clunker.

   • The Microsoft ME editor shipped with the MASM 5.0 also seems to be a klunker. — 1988
3. •
   (US) A machine built purely out of necessity from salvaged, donated, or outdated parts.
4. •
   (US) (computing) A Franken-PC; a Frankensteined system thrown together using mismatched or outdated leftover parts.
5. •
   (US, slang) A heavy, balloon-tire bicycle (usually vintage cruisers) that is modified with motorcycle parts and used for extreme off-roading down mountains; these bikes are widely considered the very first mountain bikes.
6. •
   Synonym of klinker or clinker.