bestest
Bestest (adjective) means Informal, playful intensifier meaning "the very best," used for emphasis rather than correct grammar. Example: “You are officially my bestest friend in the whole world.”
How to use bestest
Learner’s notesIn plain EnglishA deliberately childish or affectionate way of saying "best," used for emphasis in casual speech.
Not standard grammar — never use "bestest" in formal writing; it works only as playful, informal emphasis.
Trace the full origin ↓Fill the gap
Can you complete this real example?
You are officially my _____ friend in the whole world.
Etymology
Formed by adding the regular superlative ending "-est" onto "best," which is already a superlative — a playful double intensifier.