Yeah. You know it.

4 seconds sound clip from the Grease (1978) movie soundboard.

You can hear this line at 00:31:21 in the Blu-ray version of the movie.

Quote context

[...]

- Lady? I don't see a lady.

- Shut up. Shut up!

- What's up, Kenick?

- One guess.

- You got a lot to offer a girl.

- Yeah. You know it.

- What say, Zuk?

- You're lookin' good, Rizz.

- Eat your heart out.

- Well, sloppy seconds ain't my style.

[...]