Laying and balancing horizontally on random objects in attempt to boost swag. Pictures are usually taken to capture the erect posture you hold whilst in the act of planking.
Lawrence: "Bro I was Planking
on a garbage can last week"
Ragu: "Did you snag a pic?"
Lawrence: "Heck yes! I was as stiff as a black man's sausage."
Ragu: "RADICAL BRO."