A term used to describe someone who overreacts to a situation with spazy body movement and/or ridiculous facial expressions, thus making them look like a complete ass. If this act is caught on camera it is even worse.
Johnny can't get his locker open. After several tries he begins to get frustrated and decides to violently kick the locker in anger repeatedly. In this particular situation onlookers only see some douche violently kicking a locker/looking like a complete ass. One onlooker might say quietly to a friend "jeez..Adoy!" and the friend would giggle in agreement.