Short for Yung Nostradamus, a famous, well known Call of Duty player. Many people on Xbox Live have played with him, and mostly lost. They often suffer humiliation to his Tac Knife, or mini uzi thermal.
He is basically that pro you find in most games that goes brah brah brah and you all dead cause you dun know where yungnostro comin' from!
He is every woman's hero, and gets lots of sex after killing you all at COD. A straight up g, he'll slay you then punish yo ass. A typical phrase of his is:
And hata's watch out cause he's gonna end you up the butt.
Player 1: Yeah! We're in the lead!
Player 2: Aw shit Yungnostro just joined the enemy team.
*BRAH BRAH BRAH BRAH*
Player 1: SHIT WHERE YUNGNOSTRO COMIN FROM!