"Ski'd up" means to be wearing a Ski Mask.

Ski mask are also known to some people as a Balaclava.

You wear ski mask to hide your identity or when it's really cold outside and your face begins to feel frozen.

The bad guys in movies usually be Ski'd up.
On Plies' album "Definition Of Real" cover he's "Ski'd Up".

In the scene "payback for Harold" in the 90's movie "Menace to Society" Kane and O-dog were "ski'd up" when they murdered the Bloods in front of the outdoor restaurant.

Goons are normally get Ski'd up before hitting a Lick or doing a Hit.
by Duval County 904 October 21, 2012
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