Bloviate

To bloviate means "to speak pompously and excessively" or "to expound ridiculously". A colloquial verb coined in the United States, it is commonly used with contempt to describe the behavior of politicians, academics, pundits or media "experts," sometimes called bloviators, who hold forth on subjects in an arrogant, tiresome way.
The current verb 'bloviate' seems to be regarded as a back-formation from the noun blowhard.

The Oxford English Dictionary indicates that bloviate derives from adding a faux-Latin ending to the verb 'to blow' or boast, following a 19th-century fad of adding Latin-like affixes to ordinary words. However, others like William Safire claim that 'bloviate' comes from combining the words 'blow-hard' and 'deviation.'
Although 'bloviate' is listed in slang dictionaries as far back as the 19th century, the term was popularized by United States President Warren G. Harding in the 1920s. Famed for his poor English usage, Harding often used the word to describe his own speaking style. The term dropped from popular usage following his presidency but was resurrected in the 1960s when it was sometimes used in reference to Harding.
It became widely spoken again in the 1990s. Today, it appears regularly in The New York Times, The New Yorker and The Washington Post.
The term is used frequently by Fox News commentator, whose show, The O'Reilly Factor, concludes with requests for email. The request for feedback sometimes includes: "And please when writing to us no bloviating, my job."
'Bloviating' has taken on new life in the blogosphere, used derisively to identify and otherwise chide the most pompous of contributors to message boards and forums.
 
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