When you unscrew someone's showerhead and fill the inside with feces. That way the next time they take a
shower they will
literally be covered in shit. Similar to the Upper
Decker, the SkyBox is a step above.
A-"That
asshole forgot to lock his
door so I left him a present."
B-"What'd you do, give him an Upper
Decker?"
A-"Nah, this dick deserved more, so I SkyBoxed him."
B-"You sick bastard!"