When a huge winter blizzard surpasses a previous large winter storm (see snowpocalypse) and dumps copious amounts of snow in a place unprepared for such large snowfall amounts thus grinding entire transportation, retail, school and government systems to nearly a complete halt for several days. Results in extreme cabin fever leading to massive snowball fights and excessive photography.
I've been trapped in my neighborhood for five days now without mail, phone or electricity because of the Snowmaggedon !!!