hawkeyefan
Legend
From my understanding, the actual meaning is what you say: expecting everything to go your way and damn everyone else at the table. The player-side, less socially empowered MMI.
The common usage however, is 'not wanting to play an interchangeable mook, wanting some level of agency, and most importantly, displaying any level of attachment to your character'.
What is also interesting is that, despite complaints about using a pejorative term like Mother May I to label a playstyle, no one bats an eye at Main Character Syndrome, even though it’s clearly used as a pejorative.