The 1week1day anniversary of one's birthday occurs exactly one week and one day (exactly 8 days) after a one's real birthday. It is highly useful when you've forgotten to wish someone a happy birthday on their actual birthday because you are a jerk and only realize it an entire week and a day later.
Of course I didn't forget your birthday! I just wanted to wait till the 1week1day anniversary to wish you!
by ShawnDijon3000 April 17, 2009
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