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Kiloversary or k-day refers to the day when someone or something is an even multiple of 1000 days old. Such as: when someone is 35 years, 7 months and 3 days old they can celebrate their 13th kiloversary or k-day.
I used WolframAlpha to figure out what my kiloversary is.
by the bromiester February 12, 2010