I know it relates to mia and ss, but what does it stand for?
Incoming. For example, "Turtle kamikaze inc!"
Inc = Incorporated. Or Incoming, generally used as a terminology for a business.
Incapacitate. They want you to kill the champion.
© 2013 Riot Games, Inc. All rights reserved. Riot Games, League of Legends and PvP.net are trademarks, services marks, or registered trademarks of Riot Games, Inc.