Playing the air drums
The act of masturbating whilst sitting in a parking lot
Campus Police officer: Sir, what are you doing here with your penis out?
John: hey officer, just playing the air drums .
John: hey officer, just playing the air drums .
Play it by air
In New Zealand, english is not their first language, so idiots think that "Play it by ear" is "Play it by air" which means "go with the flow... of the wind.
Let's Play it by air