How is “on the button” used?

In American Movie (1999), one line is: “Get ready again. Put your hand on the button.”

Which movie is “on the button” from?

The clip at the top of this page is from American Movie (1999).

Get ready again. Put your hand on the button.

7 作品で登場 · 1 本目

at exactly the right time or at the exact time mentioned

7 本の映画に登場

1
at exactly the right time or at the exact time mentioned
We arrived at 4 o'clock on the button.
2
exactly right
You're on the button there!

定義：Oxford Advanced Learner's Dictionary 第 9 版