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.
GUY1: i know what a fag