Definition from Wiktionary, the free dictionary
butthead (plural buttheads)
- (vulgar, colloquial, pejorative) An annoying person or someone who is difficult to get along with.
2009, Glenn R. Schiraldi, The Post-Traumatic Stress Disorder Sourcebook, page 131:
- If you think, "He is such a butthead," you might ask yourself what a butthead...