That's the stuff British spoken language
Said when you think something is great; said to praise someone for something they have done well.
A: Mom, I got the highest mark on the Maths test! B: That's the stuff, sweetie!
Yeah, that's the stuff. Nothing like going to the pool on such a sultry afternoon like this.
Used to describe someone or something that is very cool or good
Used to say that someone should cool down or calm down
Used to describe something that is very fine, pleasing or excellent
Cool, great.
To be the most oustanding, excellent, or extreme example of something
The origin of this expression is not clear.
To decide to believe someone‘s saying although they may not tell the truth
He said that he was late because he had an accident and I gave him the benefit of the doubt.