The name of the group combines the Japanese words for "vomit" (??, gero) and "diarrhea" (??, geri) with what is supposedly the sound of these actions occurring simultaneously (???, gegege). It has also been transliterated to mean "barf, diarrhea, ha ha ha," although "gegege" is possibly a humorous reference to GeGeGe no Kitaro, or an onomatopoeic word of disgust or exasperation, making the name open to several differing interpretations. To (very) loosely translate the name, Yamanouchi has also used the term "Japanese Ultra Shit Band".

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It really is a name of win. http://en.wikipedia.org/wiki/The_Gerogerigegege