Top definition
A state of being unable to remember seemingly simple things such as keeping appointments and returning phone calls.

While occasionally a natural condition for some people, it is most often a temporary state triggered by excess stress and/or a lack of sleep. It should not be considered an accurate indicator of a person's intelligence.
I didn't mean to stand you up at the coffee shop last night. I got a bit moonbrained and completely forgot we had plans.
by The Lord of Eltingville May 18, 2008
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