The word is "cool," and it had an immense amount of currency back in the Sixties. I didn't use it much myself, but it didn't particularly bother me, other than that it was applied to everything. But a friend of mine taught Art in high school, and he heard it about forty times more often than I did. One of his students turned in a cartoon which my friend thought was not only not funny, but in generally bad taste. He said so. The student said, "Well, gee, Mr. Landberg, I though it was real cool!" My friend responded, "If, by 'real cool,' you mean 'not so hot,' then I quite agree!"

Don Firth