How is “be lookout” used?

In This Is the End (2013), one line is: “There's a lookout.”

Which movie is “be lookout” from?

The clip at the top of this page is from This Is the End (2013).

Modismo

used to say that you do not think sb's actions are sensible, but that it is their own problem or responsibility

informal · británico · Se oye en 52 películas

be sb's lookout
used to say that you do not think sb's actions are sensible, but that it is their own problem or responsibility
If he wants to waste his money, that's his lookout.

Definiciones del Oxford Advanced Learner's Dictionary, 9.ª edición

There's a lookout.

En 8 películas · n.º 1