The act of pushing on a skateboard with the wrong foot. If you skate goofy (with your right foot forward,) then you would push mongo if you pushed w/ your right foot. Depending on where you go, mongo pushing is either accepted, or hated. Many beginner level skaters push mongo, so some people see it as the mark of a poseur or a noob.
a skateboarder who leaves their trailing foot on the board and pushes with their leading foot. for example, when riding "regular" (left foot in front), the skater pushes with their left foot, and when riding "goofy" (right foot in front), the skater pushes with their right foot. this style is frowned upon by the general skateboarding community for a couple of reasons: 1.)not well-balanced; center of gravity is off and 2.)looks awful; negative style points.
tell that mongopusher to stay away from me. he's a pussy deterent.