Jack Schitt 

A term used for someone who does nothing. Based on the phrase "I'm not doing jack shit."

Tommy is such a Jack Schitt.

Jack Schitt by Rellik Uzi August 18, 2010

Jackshitter 

Someone who enjoys jacking off at the same time as taking a shit. Usually a guy named Ketan.

I was watching porn while on the pot.

I couldn't help but jackshit..

When his buddies found out he was jacking off while taking a dump, he was forever known as a jackshitter..

Jackshitter by Jayjay May 3, 2014

Jackshitting

Genuinely doing "jack shit" all day. "Jackshitting" is often referred to as "procrastinating", but procrastinating implies you actually have something to do, while you jackshit without having to have a life.

Susie: "James you wanna go paint drying?"
James: "Nah, I'm okay. I think I'll just jackshit here on the couch."
Susie: *sigh* "You're always jackshitting about."

Jackshitting by BritishTeaCup August 7, 2014