I can tell you what a snivellin', blatherin', cowardly lot you are.
6 seconds sound clip from the Dark Command (1940) movie soundboard.
You can hear this line at 00:52:35 in the Blu-ray version of the movie.
Quote context
[...]
- My father's bank is safe! Listen to him!
- Give him a chance to talk to ya. Your money's safe.
- Hey, son. Give me that gun you're so fond of totin'.
- That's better. Now there's a little quiet.
- I can tell you what a snivellin', blatherin', cowardly lot you are.
- Liar!
- Crook!
- You'll get your money. This bank is sound! Your money's safe, I...
- That's what comes of carrying a gun, son.
[...]