1 definition by Motosake

Purple rain is when a guy cums on his partner under a blacklight. The blacklight makes the semen glow purple as it rains down on their face. Therefore making purple rain.

Some say that its only a gay thing where a guy cums on another guy, but i don't see why it has to be limited to that.
"Dude, check this out. I just got this new blacklight. So next time i bust a load on her face, it'll glow!"

"Woah, thats purple rain bro!!"
by Motosake June 1, 2013
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