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1.
Definition 1: A reply to be used when someone thinks they have the answer to a question but another individual participating in the argument proves them wrong with a detailed and knowledgeable answer with no sympathy for the other original participant's dignity or reputation.

Definition 2: A reply to be used when someone replies to an insult or argument with a flawlessly epic one liner or put down.
Example: "You've just pee'd in my cornflakes."
by Nathan Speirs... May 15, 2010