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The act of reaching a sexual high, or orgasm, while listening to Lady GaGa, or anything pertaining to her.
Example of GaGorgasm:

Person 1: Hey, did you hear Lady GaGa--
Person 2: RARAAHAHAHROMAROMAMAGAGAOOHLALA!
Person1: WTF?!
Person 2: Sorry, I just GaGasmed
by Mecha-Kitty April 18, 2010
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