What does ":'D" mean?

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Jan 13, 2017 20:30
The native speakers of English often use ":'D" at the end of sentences. I reaserched the meaning in a dictionary, but I didn't lean about it. What does anyone tell me it means?
英語のネイティヴスピーカーは時々、 ":'D"というのを文末に使用します。辞書で意味を調べたのですが、分かりませんでした。どなたか教えてくれませんか?