nabb
A high-level player who acts like a baby. Or a smart person who does something idiotic or says something stupid.
"He has 100 kills, but he still says 'I hate this game.' He's a nabb.", @GamerGossip
"She got a perfect score, but she still said 'This game is stupid.' She's a nabb.", @GameTalk
"He's a genius, but he said 'I don't know what a computer is.' He's a nabb.", @SmartButDumb"