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).

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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

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they aren't playing with a full deck

When adults have mental issues, whether diagnosed, or gone undiagnosed, that lead them to act out erratically, or not like a logical, pragmatic individual.

Example: "they aren't playing with a full deck."

Damien: I ain’t going after nobody! They are fully grown adults. If they choose to go out that door, mad, or whatever, so be it.

Jimmie: Well, they may be fully grown adults, but…

Felicity: (Cutting her father, Jimmie, off). But they aren’t playing with a full deck.