antiversary

{n} a contraction of 'anti' and 'anniversary'. The date of a breakup/divorce, etc.

September 6th is my antiversary.

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antiversary

The anniversary of one's breakup. Sometimes celebrated by people with a sense of humor.

Justin isn't your antiversary coming up?

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antiversary

January 28. The day when Rihanna released her 8th studio album "ANTi".

Happy #antiversary!

Antiversary

What would have been an anniversary but is not due to a divorce or getting laid off.

Today is my 25th Antiversary.

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Antiversary

(n.) The calendar day corresponding to a day in the past when something irretrievably shitty occurred.

Tomorrow is the antiversary of my hound dog's death, and I'd rather drink liquid lye than go to work.