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user 66974
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The idiom uses the expression as hell in the sense of

(slang) To the maximum degree.

  • When I read that passive-aggressive note from my neighbor, I was mad as hell. Oh man, I haven't slept in days—I'm tired as hell.

(The Free Dictionary)

As hell:

used for general emphasis:

  • I’m serious as hell. I’m leaving him. (as) sure as hell: I know what you want, as sure as hell.

(Macmillan Dictionary)

  • So, funny as hell means very, very funny.
user 66974
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