The Gorilla is a mating technique developed by the drunk male. This strategy must be implemented from behind so that the female is completely unaware (otherwise known as the "sneak attack"). It involved a frankenstein-slash-zombie-like outreach of the arms over a female's shoulders followed by a sloppy and uncoordinated death grip around her neck/chest/anything in reach. The male then proceeds to try and dance with the female. Women who fall for the gorilla tactic either can't think or are painfully unstable.
Caleb: Try the gorilla on that one over there. Looks promising.
An invisible entity, that, after a long night in a pub or a curry house, follows you home and while you're sleeping chucks your clothes round the room and shits in your mouth.
"I woke up the next morning with a foul taste in my mouth and my clothes everywhere. The Gorilla had been."