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FAB move means you hit on a girl so hard you might as well have kicked her in the crotch. It’s when you try to seduce a girl just to get her to leave with you, usually because you’re too dumb to ask her straight up.
I did a FAB move on my crush and she just stared at me like I had two left feet.
He did a FAB move at the party and ended up with three girls in his car.
I tried a FAB move on my teacher and got detention for life.