This is simply another word for masturbating, commonly used by members of an older, more mature audience.
guy 1: wow that chick is so hot
guy 2: your right, gunning the motor feels right about now.
guy 1: nice........don't tell me stuff like that.
guy 2: your right, gunning the motor feels right about now.
guy 1: nice........don't tell me stuff like that.
by busta_nut_94 April 18, 2010
Get the Gunning the motormug.