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)

(noun) A successful type of theft which results in an acceptable, impressive and rewarding payday for the protagonist.

Term derived from the ancient greeks, meaning someone who enjoys the muff.
Or also commonly used to describe someone of mental retardation.