1. Noun

   piece of junk; worn-out article

   彼の古い車はポンコツ寸前。

2. Na-adjective (keiyodoshi), Noun which may take the genitive case particle 'no'

   clumsy; useless; no good; unreliable

3. Noun

   dismantled car

4. hitting (with fist); striking

   Dated term

Also written ぽんこつponkotsu