The term started in England with the old expression " Top of the morning to you". The term then was said when noble men would "tip" the "top" of there top hat in the sign of their well being. Hence they are tipping there top to signal they are in top shape or things are at the top of the order.
Is a game played when their is a mass quantity of post-it's at disposal. The game rules are you can punch any one who as a post it on their body. The second rule is , you can only punch the section of the body the post its on.
man 1: "whyd you just put that post it on me"
* gets punched*
man 2 : " POST IT PUNCH!"