Meaning & use
mostest
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An informal, humorous, nonstandard superlative meaning 'the most' or 'the best,' used for emphasis.
See it in a sentence
She called her grandmother the 'hostess with the mostest.'
He bragged that his team had the mostest wins in the league, grinning at his own grammar.
A note on using this word
Popularized by the phrase 'the hostess with the mostest,' the word is a playful, deliberately ungrammatical double superlative rarely used in serious writing.
Make it your own
Write a sentence using “mostest”, then compare your use with the examples above.