"Sentiment extremes" refers to situations where the emotions or opinions of a group of people become very strong or intense, either positively or negatively. Full definition
Sentiment extremes often exist only briefly ahead of market turning points and disappear quickly as prices adjust, or even pause. (businessinsider.com)
That said, bull contrarians could cite the tendency of sharp price moves to correct, as well as bearish sentiment extremes providing occasionally stellar buying opportunities. (us.etrade.com)
A day like yesterday — a classic Bear Market rally, with the Dow up 276.74 points, and the Nasdaq gaining more than 3 % in the session — can only occur when sentiment extremes are reached. (bigpicture.typepad.com)