Superlative form of fitty; most fit, most suitable, or in slang, most attractive or fashionable.
Superlative of 'fitty' or 'fit,' formed by adding '-est.' The slang meaning has become quite popular in British English in recent decades.
The fittiest person at the party is probably also the most well-dressed—modern British youth have playfully repurposed this old word-formation rule to create superlatives of slang adjectives!
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