Daddy-o is a finger game. You make an OK sign with your pointer finger and thumb, then show it below the waste. If someone looks at it, you have to make an "X" on their upper arm, hit it lightly, then wipe it off. If you forget the steps, they have the right to do it to you and hit you hard. If someone spears your Daddy-o, you are lame and deserve to be hit hard. It is a fun game and contagious, especially if it starts being played in a school.
Look at the definiton! It is the example. Yo, you just looked at the Daddy-o and I am gonna hit ya hard!