"thinkin'" meaning in English

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  "lang_code": "en",
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          "ref": "2003, Kiyohiko Azuma, edited by ADV manga, Azumanga Daioh : The Manga, volume 1, page 160:",
          "text": "Every Christmas I get to thinkin' 'bout Santa's reindeers with their red noses. Man, that's wrong! He just uses them for their noses, like light bulbs or sumthin. It ain't right.",
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