A fork of Rural Dictionary
Think of an absolutely awesome party abruptly and absolutely ruined by the arrival of your grandfather along with his comments about the insolent and hopeless youth. Well that's a royally grandpa-pee'd moment.
Well a grandpa-pee'd moment is pretty much obvious, you cannot miss it when it strikes down on you.
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."