In the military, if a live grenade landed near a group of soldiers one of them would jump on the grenade to try to save his fellow soldiers. When a guy jumps on a "grenade," it symbolizes the grenade as the ugly girl in a group of girls at a club or party. Grenade Free America is a term used by the fist-pumping douchebags on jersey shore
"dude that girl by the bar is a perfect 10, i need you to jump on the grenade to her left though"..this situation would happen if it was GFA
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