Vinny Gambini: Everything that guy just said is bullshit.
Vinny Gambini: Is it possible, the two youts-
Judge Haller: Uh, two what? What was that word?
Vinny Gambini: What word?
Judge Haller: Two what?
Vinny Gambini: What?
Judge Haller: Did you say "youts"?
Vinny Gambini: Yeah, two youts.
Judge Haller: What is a yout?
Vinny Gambini: Oh, excuse me, your honor. Two youths.
Chosen answer: He never says that it was "his" idea. The actual quote from the movie is that on "a" hunch he looked it up. From the way it is worded in the movie, it appears he said it this way in order to appear impartial in bringing any new evidence to the court's attention, not necessarily just information that would benefit the defendant's case.
Jazetopher