Taking a shit. "Cosbies" refers to the Cosby Show, in which Bill Cosby had approximately fifteen kids. You can replace "Cosby" with the name of one of the kids from the show, i.e. - "Dropping Off A Theo" to indicate a large dump, or "Dropping Off a Rudy" to indicate a smaller turd.
Goddamn man, pull the car over, I need to drop off some Cosbies.
by JohnsoroATL December 21, 2004
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A variation of "Drop off the Cosby kids at the pool", whereas dropping off the Cosby kids and the pool means having diarrhea.
*storms for the bathroom* "OUT OF MY WAY!"
"Why? Do you have to drop off the Cosby kids at the pool?"
"Worse. I have to drop off the Cosby kids AND the pool!"
"Uh...okay, then. Good luck with that."
by NotCaptainSlow December 18, 2012
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