A legendary player in the game Regnum-Online, both for his skill and the fact that no matter what is asked his standard answer is "I can't be arsed"
In a sense Fighting Irish is both used as a derogatory name AND as a positive label of empowerment.
Hey dude, can you help me?
- I can't be arsed
Quit being Fighting Irish.
Wow, did you see that guy kill 5 players in a row?
- Yeah, that's Fighting Irish