Present participle or informal variant spelling of 'finicking'; being fussy or particular; continuously finding fault with small details.
From finick plus -in variant of -ing suffix. This represents a dialectal or colloquial spelling, showing how informal speech and writing preserve older spelling patterns.
Dialectal spellings like 'finickin' without the g are disappearing from English as spelling becomes standardized, but they show that people have been dropping the 'g' in gerunds ('-ing' words) for centuries in casual speech!
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