I'm Gonna Cum On You - A wild and funny way to say you're about to blow your mind,

A wild and funny way to say you're about to blow your mind, usually because you're high, drunk, or just really excited.

I'm gonna cum on you, I just won the lottery.

I'm gonna cum on you, I just ate a whole pizza.

I'm gonna cum on you, I just got a new pet lizard.