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Explanation: This is "Merry Christmas" just said in Katakana. If you really want to "translate" it, you could say something like, "tanoshii kurisumasu wo"
However, it is way more common to say it this way. Even kindergarteners say "merri kurisumasu" in a holiday season. I am a native Japanese and grew up saying it myself when I was living in Japan since I was little.