When a teacher writes on a chalk board and doesn't explain anything. THey don't talk about it, they write about it, and expect you to know a whole new concept.
GUY 1: hey, did you get what he was talking about in physics? i didnt understand those notes.
GUY2:no way, he's the worst teacher, all chalk talk. Doesn't explain anything.
When you utilize the chalkboard as an emotional ballast, where you write things on it to see if doing things on it make sense to do in real life.
I did some chalk talk, where I wrote if I should talk to my friend, to see if it looks right to do that, and after much examination I think it does! Hopefully it goes well with her in real life.