You're varmints. You're one of the lowest members of the food chain and you'll probably be replaced by the rat.
5 seconds sound clip from the Caddyshack (1980) movie soundboard.
You can hear this line at 00:23:35.541 in the Blu-ray version of the movie.
Quote context
[...]
- Well, the world needs ditchdiggers too.
- Great big gobs of greasy, grimy gopher guts.
- How about a nice, cool drink, varmints?
- Scum, slime, menace to the golfing industry. You're a disgrace.
- Come to Carl, varmint. Come to Carl.
- Ah! Okay. I guess we're playing for keeps now. I guess the kidding around is pretty much over, huh?
[...]