computerguide18's definitions
The act of masturbating very quickly when given a narrow window of time. Usually occurs when there is a brief period of time when one can masturbate without being seen by others.
I got a lap dance from that hot chick at the strip club and then I went over in the corner and had a fast jack while no one was looking.
by computerguide18 November 16, 2011
Get the Fast Jack mug.