negaversary 

A day that is exactly 1 year before the planned event such as wedding (term originally coined by Sean Ryan).

I'm going to get married after a year on this day with Mona. Today is my negaversary and I'm not sure if I'm supposed to take her out.

negaversary by sytelus May 5, 2009

Nonaversary 

The day you were married to an ex spouse. Your non anniversary.

I celebrated my Nonaversary by throwing darts at a photo of my ex.

Nonaversary by Faster Redhead May 5, 2016

nonaversary 

The date that you got married to your ex-spouse

I'm celebrating y first nonaversary by getting a boobjob and going to South Beach with my squad.

nonaversary by Faster Redhead May 24, 2016

Notaversary 

An anniversary that would have happened if you were still with your last meaningful partner in a relationship.

I don't think I want to go out tonight, it's my and Lisa's one year Notaversary.

Notaversary by EPucci June 8, 2016

Nexiversary 

The result of having a profile on the site www.nexopia.com for a year, and recieving plus for a week.

Many people rely on this for plus, because they cannot afford five dollars to spend on the internet

Wickedgame - I do not have five dollars to spend on the internet QQ. Ah well, I shall wait until my Nexiversary

Nexiversary by FunkMast3r November 29, 2009