Most Helpful Guy
It stand for Optimus Prime. The leader of Autobots.
Or it could be original poster but I dunno.2
Most Helpful Girl
It stands for Overly Powerful, since the mytake owner can feel that way sometimes about what they wrote.0
It's internet lingo. You would find that is forums. OP means OPPA GANGNAM STYLE LOL jk, it means Original Poster