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Usually a single curse word or indecency during a live TV or radio broadcast. It's the media's version of the "F-Bomb", used by the FCC in assessing fines against broadcasters.
Joe Biden's comment on Health Care Reform after introducing the President ("'s fucking important...") was a Fleeting Expletive.

Janet Jackson's wardrobe malfunction in the half-time show of Super Bowl XXXVIII was a visual Fleeting Expletive.
by Doktari July 15, 2010
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