A stoner who falls asleep (due to inhaling mass amounts of the chemical substance "THC") in the sun, sometimes obtains a sun burn. This burn is called a Stoners Tan. Stoners Tan's are easily identifiable by the uneveness of the tan, often only covering one side of the stoners face.
Haha~ Tyler's a fucking idiot getting stoned and passing out in his backyard. He's reppin' the stoner tan to the fullest!