What is Airmail?
To throw a ball too high, and have it sail over the head of the person you're throwing it to. Usually used in baseball.
Ichiro was safe at third base because Guerrero airmailed the throw into the stands.
To fart in someones face, usually unexpected.
Dude you just airmailed Liza and her hair flew backwards.
To have a turd in prison, wrap it in a piece of toilet roll, throw it out the nearest window onto any unsuspecting fool below, how unfortunate
"Johnny B, why you throw tha' airmail out at me homes?"
"Toilet wasn't flushing properly, good sir"