1 definition by utmichael2008

Top Definition
Originally Latin meaning "quod erat demonstrandum" or "which was to be shown or proven", now used mainly by physics students to insult someone when something is proven wrong or false, typically with the words "Mother Fucker" added for effect.
Ha! Your're wrong.. QED mother fucker!
by utmichael2008 March 15, 2005

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