DEROGATORY - BUT NOT HOMOPHOBIC - NICKNAMES THAT USE "BUTT"

This one has been sitting in the requested lists pile long enough to make it awkward. Some liberties taken to expand into other root terms.
  1. buttsnorkel
  2. buttnugget
  3. buttcrouton
  4. buttmunch
  5. buttsniffer
  6. butthole
  7. buttwipe
  8. butthead
  9. assbasket
  10. taintscraper
  11. grundlebrush
    I cofounded this insult.
  12. grundlehamster
  13. grundleschooner
  14. Buttface
    Suggested by   @sally
  15. Asshat
    Suggested by   @sally