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

v. collectively or individually finding someone/something to blame for a problem, as opposed to brainstorming which connotes finding solutions to a problem

n. the act of finding someone/something to blame for a problem

(from a TV ad for HD television)

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

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

The first anniversary from breaking up with an asshole where you go out and party.

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