Movies
You ain't leading but two things right now: Jack and Shit. And Jack just left town.
— Ash ‧ Army of Darkness
Behind the line May contain spoilers.
Our reading
An editorial interpretation.
A boastful put-down mocking someone's total lack of followers or authority. Wordplay turns 'Jack' and 'Shit' into mock names for the only people supposedly following him, a double insult about commanding nobody. The humor comes from stacking absurd bravado onto a dismissive jab at someone's empty leadership.
Context reviewed