The idiom "not playing with a full deck" means that someone is not very smart or is mentally unstable. It is used to describe someone who is not thinking clearly or is not able to understand things properly.
This idiom comes from the game of cards, where a full deck means having all the cards in the deck. If someone is not playing with a full deck, it means they are missing some cards and therefore cannot play the game properly.
In everyday conversation, you might use this idiom to describe someone who is acting strangely or making poor decisions. For example, if someone is talking to themselves or doing something that doesn't make sense, you might say "I think he's not playing with a full deck."
It's important to note that this idiom can be considered offensive or insensitive, especially if used to describe someone with a mental illness. So, it's best to use it carefully and only in appropriate situations.
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