What is goo gun?

To insert a pinky in the anus and a forefinger&middlefinger in the vagina at the same time(with the same hand).

+ That girl was soo freaky she let me use the goo gun on her.

+ 1 in the poo, 2 in the goo!

goo gun - video

Goo Gun; n. The male genitalia, so named for its ability to eject bodily fluids.

Chicho "How did it go last night?"
Joe "I assaulted her with my goo gun!"