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BoingBoing reader Greg confesses, "I found this site at 2:30 in the morning, so it might be less funny in the light of day. It is a speed metal sesame street cover band. The singer actually sounds like cookie monster too."
This reminds me of browsing through the bins at my favorite punk rock record store when I was a teenager, and seeing that some snarky, pop-hating employee had creatively relabeled the bin for one famous hair-rock band as "Oreo Speedcookie." Snip from Cookie Mongoloid website:
Link.Cookie Mongoloid is Sesame Speed Metal! See the Cookie Mongoloid in all his blue, furry, googly-eyed glory backed by the baddest of gender mixed metal bands as they decimate and regurgitate your childhood favorites in an abrasive metal wrath. See their harem of gothic gyrators, the Cookies, demonstrate such elemental concepts as up and down in a blaze of lights, smoke and pyrotechnic cookie shrapnel.
Update: Chronicle Books editor Alan Rapp says, "Part of the joke here (I think) is that "cookie monster" is a vocal style associated with black metal and grindcore, notable for its deep basso eeeevil rumble. "