MeeVee got the chance to talk to Ed Helms during the Golden Globes:
Who came up with “Big Tuna”?
I wish I could take credit for it, but Greg Daniels [wrote it], in the first episode of the season. I’m very happy about it, because it automatically puts me in character.You know only Andy would be like, “T’sup, Big Tuna?” It totally puts me there.
Link: Interview with The Office Star Ed Helms