What does A Freudian slip is when you mean one thing but say your mother mean?

That's a funny way to put it, but it's not quite accurate.

A Freudian slip is a verbal mistake that is thought to reveal unconscious thoughts or feelings. It's not specifically about saying "your mother" but rather about saying something different than what you intended, often something revealing about your true feelings or desires.

For example:

* You meant to say "I'm happy to see you," but instead, you say "I'm happy to see you... I mean, to see your mother." This could be a slip revealing that you are secretly more interested in someone's mother than in the person themselves.

The idea behind Freudian slips is that our conscious mind might try to censor certain thoughts or feelings, but our unconscious mind slips out anyway through these verbal mistakes.

So, while your phrase is a playful way to think about it, it's not a precise definition of a Freudian slip. It's more about unintentional revelations of hidden feelings or thoughts through speech errors.