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Slapping someone and leaving your hand on their face for more than 1 second. Thus high fiving their face. If you remove your hand before 1 second has passed, you have slapped your friend and thus subjected yourself the a slap in return.
"Man you just slapped me!"
"No, I gave you a face-high-five. My hand stayed on your face for longer than 1 second."
by bdruckman218 January 30, 2012