When you talk about language or words, that's metalinguistic.
Metalinguistic talk is about talking, so it's kind of like talking about talking!
Examples:
We had a metalinguistic discussion about the meaning of words.
She wrote a metalinguistic essay about how language works.
The metalinguistic book was about how people use words.
The metalinguistic class was all about talking about talking.
In the metalinguistic world, people only talk about talking.
The metalinguistic club is for people who like to talk about words.