1. In strip clubs, it is when you throw stacks of money all over women (this is the "edited" definition)
2. When a man ejaculates all over a woman (this is the "explicit" definition)
1. Pacman Jones brought bags full of money into his strip club, where he made it rain on the strippers.
2. As used in the lyrics spoken by R. Kelly in "Make it Rain Remix," he says these two lines: I be drilling these chicks they like Major Payne
When I make it rain, they be like "Kells... do it again," and "So ask your girlfriend my name, I bet she go
'Skeet skeet skeet, Weatherman 'bout to make it rain!'"
There is literally only one definition for make it rain. It means to throw money into the air and let it fall in a motion that mimics the rain. Hence make it rain.
I just won the lottery so I'm going to make it rain at da club so all da bitches want me.