Gainsville handshake
A Gainsville handshake is when you spot a butt crack and you stick your finger in it like you're the boss of the crack.
I did the Gainsville handshake on my friend and now he's my best friend forever.
I saw a butt crack on the bus and I had to do the Gainsville handshake. It was epic.
At the mall, I did the Gainsville handshake and I got kicked out.