noun, slang ·Uncommon ·College level

Definitions

Noun

1. 1
   An extremely stupid person, especially one who causes harm. derogatory, offensive, slang, vulgar
2. 2
   A man or woman who always thinks about sexual intercourse. colloquial, derogatory, rare, vulgar

Etymology

From fuck + brain.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.