Top Definition
The most extreme orgasm you can give a woman. Using vaginal intercourse, pump hard as you or her holds a vibrator on her clitoris while the other person fingers her asshole. Suggests that if your girl gets one, she will scream loudly, contort her face, and eyes roll back in her head.
"Dude, what happened last night? I heard screaming, did someone die?"

"Nah, dude, I just gave my girl a megagasm. It's all good."

That megagasm was so loud that I got a noise complaint from the lady next to my room. And the one down from that, and the next, and the next...
by Jirtas October 23, 2009

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