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When a person preforms cunnilingus on a woman and falls asleep halfway through, without the knowlege of the woman. The resulting snores against the vulva and labia (both mayora and minora) create a flaping action that proves to be more pleasurable for the woman than the actual intended act of cunnilingus. Unbeknownst to the woman, her partner is asleep and isn't even trying.
Woman#1: Paul is such a slob, he fell a sleep while eating me out.
Woman2: Did he atleast take a flap nap?
by Capitan Rastrero April 14, 2016
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