crackpot
n. US //ˈkɹækˌpɑt// UK //kɹˈækpɒt// crack·pot
Mostly likely a back-etymology of pot, to form crack + pot. Originally, from crack + pate. Compare typologically Russian чо́кнутый (čóknutyj) (< чо́каться (čókatʹsja), onomatopoeic), see crack for the further typology.