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An instance where someone does something unusually stupid, forgetful or otherwise unwise and embarrassing. While potentially devastating for the individual engaging in the incident, such instances are the fodder of legends, folktales and safety manuals. May or may not involve a certain fast food chain.
HAHAHA! Kevin just farted while interviewing Bono live on television! What a McMoment!

Remember that McMoment when Kevin fell out of the moving car? He lost his earlobe, but man it was hilarious!
by ChompaChewyChomp July 07, 2017
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