1. See bukake. When a bunch of men "rain" their penis juice on someone.
2. When you ejaculate from a window, especially a high rise window and "rain" your little "men" towards the ground.
3. Someone, especially a man, who suicides by jumping from a height.
Yeah babies! Cum on me! Rain over me, ya fucking raining men! YEAAH!!
I jizzed from my apartment's window. It was raining men down there.
It was raining men when Jimmy and Marc suicide by throwing themselves off the building.