not playing with a full deck

(idiom) very stupid

Example Sentences:

A: Do you like your new professor?
B: Not really, I feel like he’s not playing with a full deck.
A: Why do you say that?
B: He always gives us the wrong information. He seems so stupid!

Child: Mommy, that homeless man told me he used to be the president of the USA.
Adult: What?
Child: He said that he used to be the president, but now he is homeless.
Adult: Ignore him, son. I think he’s not playing with a full deck.
Child: Oh. Okay.

From the Blogs:

Bushies not playing with a full deck

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