A poopysack is when you get poop on your weiner, and balls.
oh fuck you just gave me poopysack
When a male wipes their butt from the front and pulls the shit towards their sack and gets poop on their sack.
Also a person who does this act. Usually with the name Tyler.
Alex: Yo did you see the Poopysack walk by?? He had so much shit on his sack.
Jared: I know!! His name is probably Tyler.