2. A pistol in general
orginally it was a acronym for Glock Automatic Pistol but some people can't tell the differents between a glock and a desert eagle so you may her some people use the term gap when refering to a Beretta
2. He emptied 6 shot from his gap
In other words, don't buy their t-shirts.
"So... you're gay and proud?"
"Hey! Hey, everyone! This guy is homo and likes it!"