Let's settle this once and for all, runt! Or ain't you got the gumption?

7 seconds sound clip from the Back to the Future Part III movie soundboard.

You can hear this line at 01:21:35.024 in the DVD version of the movie.

Quote context

[...]

- Well, something inside me told me I should be here as if my future had something to do with it.

- He'll come around in a minute. Come on.

- Come on, Doc. Let's go, Doc! Let's wake up now, buddy. Come on.

- Are you in there, Eastwood? It's 8:00, and I'm calling you out.

- It's not 8:00 yet!

- It is by my watch!

- Let's settle this once and for all, runt! Or ain't you got the gumption?

- Listen. I'm not really feeling up to this today. So I'm gonna have to forfeit.

- Forfeit? What's that mean?

- It means that you win without a fight.

- Without shooting? He can't do that. Hey, you can't do that!

- You know what I think? I think you ain't nothing but a gutless, yellow turd! And I'm giving you to the count of 10 to come out here and prove I'm wrong! One!

- Doc, come on, sober up, buddy. Let's go. Come on.

[...]