Refers to when a person with a big nose gets 'owned' in a computer game (Defense of the Ancients, Warcraft 3: TFT). This creates hysteria and people constantly cry this phrase until the person with the big nose is 're-spawned' or is somehow back in the game.
Michael the ugly shit cunt just got owned !! BIG NOSE DOWN !!
a double cheeseburger from mc donalds that you ask to have with only cheese, lettuce and big mac sauce on it. a big mac for the price of a double cheeseburger.
Bro lets go to mickey d's and get some boogey down big macs, they cost like 2 bucks less than a real big mac.