You're a regular. D.

4 seconds sound clip from the American Graffiti movie soundboard.

You can hear this line at 00:29:28 in the Blu-ray version of the movie.

Quote context

[...]

- Oh, no, sir. It's 12 and a half inches, regulation size. Now, it's been checked several times. You can check it if you like, sir.

- Look, listen. You can't fool with the law. We know that was you tonight. We have an excellent description of this car.

- I could run you in right now and I could make it stick, but I'm not gonna do that, you know why? I want to catch you in the act, and when I do, I'm gonna nail you but good.

- Happy birthday, Milner.

- Thank you, asshole.

- You're a regular. D.

- File that under C.S. Over there.

- C. S.? What's that stand for?

- Chicken shit. That's what it is.

- Ain't he neat?

- Hey, you know a guy around here with a piss yellow deuce coupe? Supposed to be hot stuff?

- What, you mean John Milner? Hey, nobody can beat him, man. He's got the fastest...

[...]