Definition of peanut-headed in English:

peanut-headed

adjective

US
slang
  • Of a person: having a particularly small head. Hence generally: stupid, foolish.

Origin

Early 20th century; earliest use found in Sewell Ford (1868–1946). From peanut + headed.

Pronunciation

peanut-headed

/ˈpiːnət ˌhɛdɪd/