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An anecdotal mental state that overtakes women after the first couple months of pregnancy that causes even well composed women to become disorganized and forgetful beyond the any otherwise explainable state. Other than intermittent cognitive lapses, the woman is normally functional. The state is usually temporary, disappearing immediately post-natal but can recur through multiple pregnancies.
Pregnant wife: Honey! Have you seen my car keys? I can't find them.
Husband: I have not seen them but since your car is idling in the driveway I'd assume you left them in the ignition.
Pregnant wife: Grrr. I hate having pregnancy brain!
by Lucius.Fox October 17, 2013
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