Top Definition
A combo of "massive smash" and "Shizer" A turd that is so large normal English can do it no justice, thus the butchering of the Scottish language. Other combos inlcude mc-fizenberg and shizer-mcnuggen-fife.
I ate a whole can of oat meal then drank a gallon of coffee. I let the atom bomb in my intestine solidify, then took a mc-sheethan so big, there was a birth certificate in the toilet.
by tb2_nola January 04, 2010
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