make it happen. More broadly, almost a regal pronouncement, as if waving your hand and granting permission for a momentous occasion or event to begin. Opening the sluice-gates of life.
I have heard all your submissions and have assesed the ups and downsides, this WILL happen, now "make it so".
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.