The act of spontaneously orgasming all over oneself.
"Look its Rain! *orgasms all over themself*"
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Anyone walks into the room and they just orgasm all over the place
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When you Sonic Blastoff so hard into Rainbow's ass that both of you shoot off into a Double Rainboom.
Basically fucking the rainbow out of her.
Wow, when I saw that Sonic Raingasm, I was slightly turned on.
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