Historians have traced this common characteristic back to the early days of equestrian training. Horse riders, after a long day of arduous training, have been shocked to find none other than peeling, dried skin on their buttocks. Common side effects are a sporadic snap, crackle and pop of the buttocks upon impact with jeans, and other such materials. Scientists have come to identify this characteristic as butt dandruff, or as modern day society has deemed it, BUTTFLAKES.
person #2: "Oh you silly thing, you have BUTTFLAKES! DUH!"
Man, I went to a gay bar last night but i couldn't breathe cuz the air had a visible mist of brown buttflakes.