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Someone who is so fly that they jump up and scream YOLO whenever there are people nearby. It is the evil counterpart of the swagasaurus and is even shorter than one.
Bob: Did you see someone jump up and scream YOLO just now? I think it was a yolodactal.

John: Oh, I didn't really notice because they're so short.
by TotallyNotColin June 22, 2013
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