Stands for: Grenade Free Nation
Referenced in season 2 of the popular reality tv show, Jersey Shore. It's what the United States should one day become.
Dj Pauly D: Yo Mike, there are grenades everywhere!
Mike the Situation: Why can't we live in a GFN?
Acronym that literally translates to "gay fag n00b"; in practice, refers to a player in a video game lacking even the most rudimentary skills, and implies an inability of said player to ever gain them.