best·​est | \ˈbe-stəst \

Definition of bestest 

informal + humorous

: best The fourth Thursday of November is definitely the bestest holiday. Food, Family, Friends and Football. … I most fondly remember the Thanksgivings of yesteryear.— Will Durst, Moderate Voice, 24 Nov. 2010

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First Known Use of bestest

1751, in the meaning defined above

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The first known use of bestest was in 1751

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