Meaning of peanut-headed in English:

peanut-headed

Pronunciation /ˈpiːnət ˌhɛdɪd/

adjective

slang US
  • Of a person: having a particularly small head. Hence generally: stupid, foolish; compare "peanut-brained", "pinheaded".

Origin

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