not playing with a full deck

an expression used to indicate that a person isn't very smart

see also - not the brightest bulb on the porch, not the sharpest pencil in the drawer, a few bricks shy of a load,

Little Davey tried to iron his short & curlies (he's not playing with a full deck).

not playing with a full deck by Hey-Johnny-Johnny June 11, 2006

He's not playing with a full deck 

Yet another way to call someone a fucking dumbass.

Person 1: hey man look at that douche-bag with the popped collar who is wearing aviators inside at night.

Person 2: He's not playing with a full deck

He's not playing with a full deck by Con#1 July 19, 2012