"Gero" is the onomatopoea for vomiting. "Geri" means diarreah. I thought the GeGeGe had something to do with GeGeGe no Kintaro, but I might be wrong about that last part.Ah, The Gerogerigegege! "Let's jack off into a recording microphone and release it as a limited edition vinyl!" Do you know that their name apparently means The Vomit Diarreah Band?
They are certianly called "Vomit Diarreah" something though. Or perhaps more accurately "Vomiting up Diarreah" something.