What is Air Punch?
The act of punching into thin air, normally as a sign you are excited because you did something cool, or your team scored points in a match, and you want everyone to know about it. This is the equivalent to the 'woo-hoo' sound made by dumb chics when they are all talking about something stupid and they want to show their agreement on something dumb. It is important to chose the right moment when to air punch, and to do it right, or you will look like a douchebag.
that douche Larry always has to air punch when the Lakers score, he looks like such an ass
eventually i had to air punch with the rest of the crowd, they were starting to turn on me
When you are fighting someone, you keep missing you're punches, making you throw them in the air. Making an air punch.
Wow, Mike kept throwing Air Punches at Kyle! What a bitch!