Definitions by Woody A.

Planking 

The act of rigidly laying face-down on anything(floor, rails, signs, etc.)

Person 1: "Hey did you hear about that guy that got arrested for planking on a police car?"

Person 2: "Well it was his fault. He was trying to do a plank that had already been done."

Planking by Woody A. June 9, 2011