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F2L means friends who get so hot for each other they can't stand it anymore. It's like when you're besties and then you start making out in the hallway.
My best friend and I are F2L now. We got caught making out in the library.
My crush and I are F2L. We text every minute and it's annoying.
My brother and his best friend are F2L. They're always kissing in the car.