How is “let it all hang out” used?

In Klute (1971), one line is: “is to let it all hang out.”

Which movie is “let it all hang out” from?

The clip at the top of this page is from Klute (1971).

is to let it all hang out.

3 作品で登場 · 1 本目

to express your feelings freely

くだけた · 2 本の映画に登場

定義：Oxford Advanced Learner's Dictionary 第 9 版