The origins of this term originate from the classic pornography film, "Behind the Green Door".
During the filming actor Johnny Keyes suffered from excessive "Porno Sweat". Star Marilyn Chambers aka Gloria Saunders had to be wiped down by stage hands. She was quoted as saying "What is wrong with you? You have some crazy Porno-Sweat going on".
This caused members of the cast and crew to break out in laughter and thus "Porno Sweat" has been used in the industry as a way of describing actors suffering from hyperhidrosis.
Scott: Damn Dan you shouldn't have run for so long you have some mad Porno Sweat going on.
Dan: Fo, Shizzle and such as.....
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A sex act:
After orgasming inside of your partner, you pull out your penis and shake it on their face causing cum droplets to rain down.
Can be used as a derogatory term for a stupid person.
John: Hold still while I give you some cum droplets!
Scott: Is this still enough?
John: Oh yeah, here comes the Maltese Rain!
*shake penis*
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