Lying face down on the ground with arms to the side of the body in unusual places to get a ''wtf?'' from people who are not accustomed to this activity.
Many plankers will take pictures of their planking and post them to the Internets to arouse laughter.
Some idiots might plank in unsafe places, resulting in stupid injuries.
Danny: Hey Drogo, did you hear what happened to Viserys?
Drogo: No, what did your idiot brother do again?
Danny: He was planking on train tracks and got hit by a train.
Drogo: Stupid Dragon.