Shave your pubes before you have sex with a chick. Later, ride her hecka hard until you have to skeet. Take out your shlong and cream on her chest and rub it around. Whip out your pubes that you had hopefully stashed in a nice tupperware or baggy and dump em on her chest. Thus, the hairy gorilla.
Other versions of the hairy gorilla:
I skeeted on the sides of her face and slapped on my pubes to create the "hairy hassidic jew"!
I skeeted on her feet and slapped on my pubes to create the notorious "hairy hobbit"!