A person who is very stupid, or calling somebody stupid.
Girl: Oh, my, gosh, she is SO oopid!
by guesswhosanMLIAer December 8, 2011
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It's a saying basically for someone to stop saying that someone is "stupid" because they are probably right behind him/her.
Like in the movie, The Lion King:

Ex - Zazu says ixnay on the oopid-stay, to warn them to stop calling the hyenas stupid because they are right behind them listening. (He just says it in pig latin.)

by Kourtnei August 7, 2006
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