1 definition by Cheesepack92

Top Definition
That feeling you get right as you're about to fall asleep, where you feel as if you are falling, so you jerk yourself awake while making a yelping sound combined with the sensation of spontaneous orgasm.
Right as Megan was about to fall asleep, she suddenly jerked awake and experienced a yelpgasm due to the sudden excitement.
by Cheesepack92 November 16, 2009

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