How is “you better believe it” used?

In The Return of the Living Dead (1985), one line is: “- We gotta tell 'em we're here. - You better believe it.”

Which movie is “you better believe it” from?

The clip at the top of this page is from The Return of the Living Dead (1985).

- We gotta tell 'em we're here. - You better believe it.

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used to tell sb that sth is definitely true

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used to tell sb that sth is definitely true
Oh you better believe it big balls

定義：Oxford Advanced Learner's Dictionary 第 9 版