Factsheet what does the word bestest mean? There are four meanings listed in oed's entry for the word bestest. See ‘meaning & use’ for definitions, usage, and quotation evidence.

Extremely good (definition of bestest from the cambridge advanced learner's dictionary & thesaurus © cambridge university press) Better than the best. See examples of bestest used in a sentence. No, it is not correct to say bestest. The word best is already the superlative form of good, so adding the suffix -est to it is considered grammatically incorrect.

The word best is already the superlative form of good, so adding the suffix -est to it is considered grammatically incorrect.