I never could figure out why our rear-ends are called "buttocks". I can understand some of the other slang but couldn't figure this one out.
So I went to Tibet and climbed a high mountain and asked a wise man who was sitting there, why are they called buttocks?
He sat there and made faces for a good while. Finally, he farted, "Why not?"
Still don't know how he did that but at least I heard it from the horse's mouth.