A coldplay coma is when someone locks themselves up in a dark room, curls up into a ball engulfed by a blanket, (can sometimes be in a bed but often times happens over a heating vent) and listens to coldplay for hours on end. Someone usually has a coldplay coma to clam themselves down after a depressing, stressful or traumatic event.
After she broke up with him, he went into a coldplay coma in his room.