An intentional misspelling of the German word "scheisse" (translated to English as "shit") intended to get around Blizzard Entertainment's ToS (Terms of Service) agreement in order to include a frequently used "inside joke" in a Diablo 3 clan name.
"I'm at 302ms lag." Complained Lucky.
"Well... quit downloading Scheizer-porn" Suggested Melviant.
Thus, clan ScheizerFrenzy was born