That's a good question.

[El Peludo]

WHAT IS THAT?       

A visiting Pastor was offering an eloquent prayer.  With his hands raised to heaven,
he began:

        Lord, without you, we are but dust, ---

He never continued.  At just that moment, a little girl, who had been paying attention for a change, turned to her Mom, and in her best loud, shrill little girl voice asked:

        Mom, what is butt dust?

[Four-Eyed Buck]

ROTFLMO ;DBuck

[Forty Rod]

Yeah, me too...ROTFLMAO. 

[Delmonico]

Well you see, butt dust takes several days to dry out, turn to powder and, never mind, I'm goin' ta bed.

[Micheal Fortune]

Eating too many crackers there Delmonico??