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Adj.

To be abnormally festive during the Christmas season.
Charlie sets up Christmas decorations on his roof.

Ralph: Why are you putting up lights? It's November 28th.

Charlie: Shut tf up, Ralph, I'm Christmas AF!!!
by Clarimond December 20, 2015
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When you have Christmas fucking spirit and decor all around the house like whoop whoop!
Oh my god like Josie is Christmas af she has her ugly Christmas sweater and her peppermint mocha and everything like oh my god
by Elittle December 17, 2015
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The feeling of absolute love for Christmas

Christmas x-mas
Person 1: Yo! I like that reindeer sweater
Person 2: Thanks mane you know your boy Christmas af!
by EnchiladaDude December 3, 2015
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