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."
James: "Nah, I'm okay. I think I'll just jackshit here on the couch."
Susie: *sigh* "You're always jackshitting about."
by BritishTeaCup August 07, 2014