taking a mean shit

The act of taking an extremely gratifying dump often resulting in extensive odor, grotesque size, and/or substantial clean up to oneself or facility.

Johnny Shatt, grimacing comically at his two friends at Bob's Big Boy, knew he pushed the limits having eaten 2 burgers, both friends' french fries, and a chocolate shake. Now, it was time to leave his final farewell to the restaurant...TAKING A MEAN SHIT! This final act would be the highlight to a beautiful evening with the lads.