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1.
A term derived from the latin word, "muffcake", but translated to english.
Short for your-stupid-and-you-think-you-know
-everything-but-
you-just-suck-at-life-and-need-to-die.

Can also be used in place of eff.(see examples)
"Andrew is the biggest muff muffin of life...fosh!"
or
"What the muff muffin are you doing?"
by ASHLE HARPER December 01, 2006
 
2.
Term derived from the ancient greeks, meaning someone who enjoys the muff.
Or also commonly used to describe someone of mental retardation.
Andrew Culp is the biggest muff muffin of life.. fosh!
by AShley HARPER November 29, 2006