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An action caused in response to something incredibly stupid. This occurs when one's palm meet their face in such a forceful manner that the palm ends up caving in the skull and making contact with the brain. Probably ends in death.
Guy: My mum just said that 2012 was a good movie... it was really awkward. :/

Girl: Oh geez, that movie was horrible. How could she say that? *brainpalm*
by SkittlesAreNomNom February 05, 2011
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