Used in the same way "Hooray!" but in a more sarcastic tone, used to (sarcastically) celebrate mediocre acheivments.
Jake: I made myself a sandwich yesterday.
Jack: Whoop de doo
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a sarcastic reply to someone who won't quit boasting.
Mike: I just climbed Mt. Everest in 5 hours with no climbing gear!
Donovan: well whoop-de-fucking-doo
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