Take A Greg
Lamens Term - Verb 
Greg gr-egg (plural - gregs)

Very similar to taking a normal shit, a "greg" differs in the fact that it usually stretches one's ass to the limits of its abilities....rendering a turd with a thin layer of blood covering it.  "Gregs" are extremely painful, & in some cases deadly.
I Have To Go Take A Greg. My Blood Type Is B+, Start Looking For Possible Matches.