Sexual act. Usually between two males, or a male and a very manly
female with anal hair.
One partner lays down on their stomach exposing their anus, the other starts from the
Gooch or Vagina and sniffs all the way to the Bum Crack, possibly getting some shit stuck in his/her nose.
Joanna the man woman was pleased when
John gave her a refresshing Snuffle
Bum. Although she acted disgusted.