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1.
a tool used by specialty artisans that adds a fine stream of paint and mixes it with air before it hits the canvas or surface being sprayed. By being able to control the paint and airflow accurately and precisely the artist can achieve amazing photo realistic techiniques that can amaze or fool the eye of the beholder.
Check out that awesome airbrush job on that motorcycle tank.
or
I can airbrush out your pimple and whiten your teeth on your photograph for the magazine
by Brindleheimers January 15, 2008
 
2.
To fart in someone's face while bare-ass, there by "air brushing" them with shit particles.
Dude, I totally air brushed John's face last night! He coughed and has little bits of shit on his lips!
by EHood January 25, 2011
 
3.
To take away a particular part of a object.
"Don't make me airbrush your _______ away!"
by Su Wang December 12, 2003