DDos - Dedicated Denial of Service. In short - grabs the interweb, bends it over and whispers in its ear "You know why". After that your modem will sounds like R2D2 having a seizure right before your power goes out and whilst its dark 6 men in Black suits and night vision goggles bursts through your door. 5 Days later you are on a bus to Peru and you do not know why, also there are stitches where your Kidneys use to be and your back itches for no reason.