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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Merriam-Webster unabridged
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Time Traveler for bestest
The first known use of bestest was in 1751
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