Definition of peanut head in English:

peanut head

noun

US
slang
  • 1A stupid or foolish person; also as a term of abuse. Compare "pinhead", "pea-brain", etc.

  • 2A particularly small head. Also: a person with such a head, especially as part of a generally small or thin frame; frequently as a term of mild abuse.

Origin

Late 19th century; earliest use found in Ohio Democrat. From peanut + head.

Pronunciation

peanut head

/ˈpiːnʌt hɛd/