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Happy Whatever-Reason-It-Is-That-Im-Giving-You-This-Small-Insignificant-Piece-Of-Crap.

Must be said enthusiastically, and is simmilar to Happy Birthday, but for occasions when it may not be appropriate to say Happy Birthday, ie someones actuall birthday.
person, whilst handing someone somthig of little or no value: Happy Christmas
by cheeseflambe July 20, 2009