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A Gainsville handshake is when you spot a butt crack and you stick your finger right up in it like you're claiming it as your own.
I saw a guy walking down the street and I had to do the Gainsville handshake. He didn’t even notice.
At the bus stop, my friend saw a butt crack and gave it a middle finger. Classic.
I did the Gainsville handshake on my crush and now we’re dating. It was worth it.