airsucking
The act of making blowjob motions in the air (sometimes including cupping of the balls) so a work mate, who is in the process of shining the bosses knob, can see you but said boss can not.
Joe was really shining Jimmy's knob. What a suck ass! I had to walk up behind him and do a little airsucking. Unfortunately for me, Jimmy could see my reflection in the window!