"Embarrassing gaffe" refers to a mistake or error made in a public or important situation that causes embarrassment or awkwardness for the person involved. Full definition
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Mr. Recchia has raised considerably more money and has the support of the Democratic Congressional Campaign Committee — but Mr. Recchia has been set back considerably by a slew of embarrassing gaffes recently highlighted nationwide on the Daily Show and less - than - optimal debate performances upon which his opponent has seized. (observer.com)
Her stint was punctuated by embarrassing gaffes and a lack of confidence in her ability to improve the city's public school system. (gothamgazette.com)