I’m about to explode!
It’s what you say when you are about to erupt with a volcanic-like explosion of cum all over the place like in South Park season 12 episode 6 minute 18:36.
Guy 1: I’m about to explode!
Guy 2: *opens mouth wide*
Guy1: *stops* stop, that’s gay.
Guy 2: *opens mouth wide*
Guy1: *stops* stop, that’s gay.