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Best Day Of Your Life. Used when someone you know, or are around, has an extremely fortunate event happen. Pronounced "buh-doy-ul." Similar to BDOML "buh-dom-ul," which is used when you are the lucky duck.
Your friend finds $20 on the curb of a street and you exclaim, "BDOYL!!!"
by DreaMHammie December 30, 2010
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