Dialectal or informal present participle of 'crap'; the act of defecating or producing something worthless.
Present participle of crap, written with dropped final 'g' to represent dialectal or colloquial speech patterns common in informal writing.
The spelling 'crappin' (instead of 'crapping') appears constantly in dialect writing and song lyrics to signal working-class or rural speech—it's a linguistic class marker.
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