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most·est | \ ˈmō-stəst 
\
\Definition of mostest
nonstandard, often humorous
—used in place of most (as in imitation of childlike speech)… Americans are such suckers for TV commercials that we are powerless to resist the product that hits us with the mostest.— Russell BakerThe disposition of personal property often becomes a scavenger hunt. Items are tagged while last breaths are being gasped. To the crudest goes the mostest.— Thomas EastonLady Pamela Berry, wife of a newspaper proprietor and in her day the London hostess with the mostest, had given a dinner party in May 1951 that deserves both literary and historical footnotes.— Geoffrey Wheatcroft
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The first known use of mostest was in 1833
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