A nonstandard or dialectal variant attempting to represent 'does not,' though 'doesn't' is the correct modern contraction.
Similar to 'didn,' this represents a failed or incomplete contraction of 'does' and 'not'; the standard form 'doesn't' won out in modern English through standardization and prescriptive grammar.
Languages are full of these 'failed' forms that lost the battle for dominance—'doesn' reminds us that English contractions didn't follow neat rules, and some variations simply died out as writing became standardized.
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