Affairaversary 

When your affair last more than 6 month or one year.

Jen, happy affairaversary. Thanks for not telling my wife.

Tim and Janice are celebrating their one year affairaversary.

Affairaversary by RagetheStampede September 12, 2017

affairiversary 

Date when you can celebrate the day you went behind the back of your ex-husband/wife/girlfriend/boyfriend and fell in love with your true love.

Guy: Hey sweetheart! Today is our Affairiversary, the day we started fooling around together and fell in love.

Girl: Aww.. it was the best day of my life.

Friend-to-guy: So dude, what are you getting your girlfriend for your affairiversary?

affairiversary by LB Hampton <3 October 4, 2010

Affairiversary 

Similar to an anniversary, this is the date you found out your spouse was having an affair.

Happy second Affairiversary, bitch.

Affairiversary by K31th August 24, 2022