butt-munch

buttmunch

rude slang One who is stupid or irritating. Ugh, don't even listen to that guy, he's such a buttmunch.
Farlex Dictionary of Idioms.

butt-munch

n. a despised male. (Usually objectionable.) You dumb butt-munch! Why did you do that?
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • buttmunch
  • (something) blows
  • bison
  • an old bag
  • an old bat
  • a copy
  • bad call
  • birdturd
  • butt-wipe
  • apple-knocker
References in periodicals archive
AMONG the duo's favourite phrases are "bunghole", "butt-munch" and, of course, "heh, heh, heh, heh".