Abdominal Surfing 

An extreme sport in which an individual slides down a rail, usually in a staircase, perpendicular to the rail, balancing on the lower ribs and upper abs. The two variations are sprints, in which a single rail is ridden down, and slalom, in which a series of rails going down a stairwell that rises at least 4 floors.

As he rounded the last corner of the stairwell, a police officer almost grabbed him, but he quickly remembered abdominal surfing, so he lept onto the last stair rail and ab surfed away

Abdominal Surfing by bad mother lover September 17, 2010