The act of brutally penetrating a person's anus with immense speed leaving behind a sandy texture and a dusty haze. Duning originates from Mongolia and anything except Jigglypuff can be duned.
When you say something is duzion, your saying that it is cool, awesome, and legit. Common spellings of the word include Dushion, dushan, and duzan, but the correct spelling is Duzion.