Gr-oop p-ewp, verb, noun A prank which entails three or more members who partake in consecutive poops in the same toilet without using toilet paper. The toilet is not flushed, leaving the owner (or next user) of the toilet to view the mountain of poop.
Guys 1,2,3: Wanna do a group poop in the girl's toilet?
Guy 4: Nah man, that's gross!
Girl(s)- WTF, the guys did another group poop in our toilet!!!!