How is “have legs” used?

In A Star Is Born (2018), one line is: “If you don't dig deep in your fucking soul, you won't have legs.”

Which movie is “have legs” from?

The clip at the top of this page is from A Star Is Born (2018).

If you don't dig deep in your fucking soul, you won't have legs.

5 作品で登場 · 1 本目

if you say that a news story, etc. has legs, you mean that people will continue to be interested in it for a long time

くだけた · 5 本の映画に登場

if you say that a news story, etc. has legs, you mean that people will continue to be interested in it for a long time

定義：Oxford Advanced Learner's Dictionary 第 9 版