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When the blowing of hot air from a oral cavity results in the recipient of the "air job" to temporarily loose feeling in his testicles ergo blue balls.
Last night at the park, I paid some broad eight bucks to blow me and all I got was an air job. Now I have blue balls so bad I can't walk!
by The Moonman June 19, 2009
Noun: The art or act of pantomiming a blow job.

It's like Air Guitar but with an Air Penis instead.

Verb: Air Jobbing
Kristy is such a prude and probably wouldn't touch a real dick, but damn! Did you see how hot she looked when she did that air job?
by Drakonnen June 08, 2010