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1.
When you go to the bathroom and you check to see how much poop is on your piece of toilet paper from the first wipe, so you can determine how many more times you need to wipe.
*In head*

This piece of toilet paper doesn't have any poop on it.

Looks like I poop checked for nothing
by A Platypus August 07, 2009
 
2.
When paid hourly, the final check of the year received after having the dedication to take a 15 minute poop every shift of said year.
"Dude, I can't wait till Friday. I'm going to buy myself a Christmas present with my poop check. "
by Spike Speedwrentch December 04, 2013