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Acronym for "Biggest Douche in The Universe." Made popular in the South Park episode with John Edwards. Shorting to this acronym allows it to be used in public without the douche in questions knowledge.

Pronounced: Bee dit ew
you: Thank you sir for giving me all this extra work, that I hope to learn from. Your a true BDITU.

bditu: "what's a beeddeoo?"

you: an acent word for great leader (or some bs along those lines).
by Luckyduzit December 20, 2006
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