That's boss.
[Slang] THAT'S BOSS. - Discover Expressions for Praising in English
really good.
That's boss" is a slang used particularly when you think something is extremely cool or impressive. Used originally in urban American settings, it has come to be a casual and emphatic way to express approval, similar to saying "that's awesome.
Example Sentences
His new shoes? That's boss, man.
His new shoes are really cool, man.
You got the job? That's boss!
You got the job? That's awesome!
That was a boss move, turning the situation to your advantage like that.
That was a cool move, turning the situation to your advantage like that.