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(n) the rubbing of a man's abdominal muscles against a woman's cash and prizes resulting in orgasm.

NOTE: The man must have heavily defined abs to create a washboard appearance to allow for optimal abgasm (i.e. John Cena, Matthew McConaughey)

John Cena is so ripped he could easily give me an abgasm.
by Stephanie D, Jeremy D June 21, 2007
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