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a condition in which ones birthday (or month) is approaching so the person in question completely ignores everything in life except his or her upcoming birthday. Constantly reminding others that his or her day is approaching, planning their own parties, suggesting gifts, and changing the subject of every social conversation in to something about said birthday.
Guy: "Greg's birthday is coming up, are you going to his party?"
Girl: "How can you not? He's only reminded me every day since last month and invited me to his 3 parties he planned for himself. His narcissistic birthday syndrome is in full swing."
by quixilver09 January 11, 2017
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