When a guy is getting a hand job, under something to hang on to, grabs hold of it, performing a pull-up until their penis is at the girl's face height, turning that hand job, into some nice dome. After he gets that one poke in her mouth, he blows his load all over her, concluding the gorilla burst.
Jonny: My relationship with my girlfriend is going well, but we have been at the handjob stage for almost 3 weeks now. How do I take our sex life to the next level without forcing her?
Joe: Just gorilla burst all over her, show her whose boss.
Jonny: Great idea joe!