For males: the act of becoming completely self-absorbed with your penis and masturbation, such that your face and mannerisms takes on the personality of a goon: tongue out, vacant expression, grunting, muttering. Men gooning often prefer hours of edging/erection to actual release/orgasm. An artifact of modern times and plentiful porn.
After smoking a huge bowl, Andy looked forward to the hours of gooning that followed.
gú-see gú-nee: The act of squeezing a woman in between her legs at the labia, from either the front or from behind. Derives from the word "goosing", to describe pinching a someone's behind, combined with "goony", to denote the specific location as being the "goona" or vagina.
The phrase is said while squeezing the area, as an exclamation, e.g., "Goosy goony! Goosy goony!"
When a girls vagina is so big it looks like a goonch catfish's mouth laying on it's side.
Will: Hey, check out this picture of my girls vagina, does it look big to you?
Mike: Wow, dude, your girl has a huge gooncher, be careful when eating that, it might eat back.