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The intense feeling of joy you get when you first bring home the Xbox game halo and pop it in for the first time.
I had the best halogasm ever when Halo3 was released for the Xbox360.
by Greg Bell September 25, 2007
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The period of time in which an person continues to feel an orgasm after having a sexual experience.
Stephanie was useless in the staff meeting because she was still I her halogasm from last night.
by Dirk217 October 16, 2018
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