by joakosolo April 25, 2011
A calendar date that once was marked to commemorate a wedding anniversary with someone who is now your ex-wife or ex-husband. Further, this term is used to express anguish and even despair at the mere thought or remembrance of the terrible relationship one used to be trapped in; causing one to feel as though they need to take a couple Xanax to help them forget. ( Xanax by Rx only however not recommended)
Oh god , today is our xanniversary, I'm going out tonight to get drunk and hook up with some random. Where's my Xanax?!
by Nunya B. Zwaaks™ September 03, 2023