Having so much godly power that you just don't care anymore. Fighting the most powerful beings is boringly easy and you don't care enough to give them a fighting chance. You just want it to be over.
"Abby has such a Saitama Complex when she plays Skyrim. She just doesn't give a shit."
Being levels above other people to the point you are unbeatable. Your interest/hobby that you have become so strong in is a bore; you actively seek challenges and are desperate when it comes to someone opposing.
"That new anime character has a Saitama Complex. He's insanely strong but he finds nothing entertaining anymore. Although, it's a great show to watch because not many people can pull off having a Mary Sue character."