A phrase yelled by a person who has just had their entire world destroyed, figuratively of course. Commonly, My World! is yelled when another person directly causes this indiscretion.
Cory: Ok Matt, just one more cup and we go undeafeated at beer pong tonight.
*Tommy sneeks in a bounce to win the game*
Matt: MY WORLD!!!
*Tommy sneeks in a bounce to win the game*
Matt: MY WORLD!!!
by Mr.Party April 16, 2010
by Daisy August 26, 2003