What the above poster said! Everyone has their own abbreviations. As long as they're not something stupid like, MILR for MI2, people will understand them. People just need to keep in mind that if they abbreviate something they have to be aware of what the other person might interpret it as!
Person 1: I like how you have to use the pink frilly pants in MI3D
Person 2: Pink frilly pants? That is TMI!
Person 1: But that's what you have to do!
Person 2: What?
Person 1: Eh?