How is “the damnedest” used?

In Barfly (1987), one line is: “Yeah, you're the damnedest barfly I've ever seen.”

Which movie is “the damnedest” from?

The clip at the top of this page is from Barfly (1987).

the most surprising…; The most extreme or thorough example of a person or kind, used to praise or to blame

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Oxford75% de las películas
the most surprising…
Isn't that the damnedest thing?
It's the damnedest thing.
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The most extreme or thorough example of a person or kind, used to praise or to blame

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

Yeah, you're the damnedest barfly I've ever seen.

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