Why does John Dorian from scrubs say Eagle?

When J.D. first said Eagle, it was when Brendan Fraiser, who plays Dr. Cox's best friend, first starred on the show and spun J.D. in the air. Zach Braff, the actor who plays J.D. said that even though J.D. doesn't necessarily want to be picked up, he is such a dork that once he starts going fast enough, he will say eagle, because he is of course, such a dork.