Refers to a exceptionally large penis, weighing between 5-10lbs. Most commonly found on African Americans but occasionly on caucasians, but never Asians.
Rooting from YouTuber Jenna Marble's video, Jenna's Drunk Art School: Balloon Art, It is basicallygripping the dick as hard as you can until it isn't hard anymore.
Girl 1: Did you and John finally do it last night?
Girl 2: No....
Girl 1: Did you gorilla gripthe dick again?
Girl 2: ........maybe