that's the stuff
1. That's really great or satisfying. Ah, that's the stuff. Nothing like a cold beer after a long day's work.
2. Good job; you're doing that well or correctly. Yeah, that's the stuff! See? You're a natural at programming code.
That's the stuff!
Inf. That is the right attitude or action. Bob: I'm sure I can do it! Fred: That's the stuff! "That's the stuff!" cried the coach as Mary crossed the finish line.