shu up

faster/better way of saying "shut up"

Girl pointing to other girls boyfriend: He looks like a fuckin chicken when he runs.

Girl with the boyfriend: Shu up!

by beky June 11, 2006

SHU up

Special Housing Unit in prison. Protective custody.

He molested all those little girls. He better SHU up when he gets to prison

by Dr. Blabby June 29, 2022