asshair

noun2

1. •
   (slang, vulgar) The hair on an animal's or individual's buttocks.

   • He stopped every few seconds and shuddered, picking asshair from the roof of his upper mouth. — 2014
2. •
   (slang, vulgar) A tiny amount; a whit; a jot.

   • Can you be a cat's asshair more specific? — 2012