The feeling of emptiness that follows the finale of the ABC series "LOST". Symptoms include using characters as your Facebook avatar for no reason, playing 4-8-15-16-23-42 on your weekly lottery tickets, eating imaginary peanut butter out of empty jars, employing phrases like "This is my destiny!" and "See ya in another life, brotha" in daily conversation - often with bad Scottish accents and out of context - and creating Urban Dictionary definitions for "LOSTalgia" as a means of coping with the loss.