A big tough shit. One that you really have to use your anal muscles to push out after eating a big meal the night before. And it hurts like hell when you push it out. It is sort of like a variation of constipation.
Guy 1: Hey dude, what took you so long?
Guy 2: I had to do a big jimmy. Christ it hurt like hell.
Run away from him he is an asshole and hates people he can’t catch you though if you run he pretty big
FUCK RUNNNN it’s Big JIMMY FAT