Gainsville handshake
A Gainsville handshake is when you see a butt crack and you shove your finger up there like it's a personal invitation.
I did the Gainsville handshake on my mom and she yelled at me for the rest of the day.
At the park, I saw a butt crack and I had to do the Gainsville handshake. It was a good day.
I did it in the cafeteria and now everyone calls me the Gainsville handshake king.