How is “that is it” used?

In Weekend (2011), one line is: “All right, that's it, I'm not playing.”

Which movie is “that is it” from?

The clip at the top of this page is from Weekend (2011).

All right, that's it, I'm not playing.

8 作品で登場 · 1 本目

this / that is the end; this / that is the important point, reason, etc.

339 本の映画に登場イディオムを再生

定義：Oxford Advanced Learner's Dictionary 第 9 版