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A shizer wilhelm is any shit you have taken or are about to take that could possibly be your largest or nastiest one. To refer to a past shit as a shizer wilhelm mass defecation must have taken place and the aftermath witnessed by one credible person. Pronounced Shh-eye-zer will-helm
Dude drive faster I'm about to take a shizer wilhelm
by Yonker April 20, 2008
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