gack in the crack
The gunk that comes out of a man's butt after a long day of work, sweat, hair, and a wet poop that didn’t go as planned.
My dad's gack in the crack is so strong, it made the whole house smell like a garbage can.
My brother's butt is so full of gack in the crack, it's like he has a lake inside.
I saw my uncle's gack in the crack on the couch, and it looked like it was about to explode.