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!"