Heniversary 

The anniversary of a persons hen do. Usually this is celebrated by going on a night out and dressing up in traditional hen do attire.

Wow! Phoebe’s heniversary was so much fun!

Heniversary by Gibby, Guppy & Giblét September 6, 2023

himiversary 

The anniversary of Him, celebrated on the 5th of every month. The incident originally occured on the 5th of October, 2019 at 12:26 pm.

Josh: Happy himiversary, Juju!
Juju: The weather is nice on this fine himiversary, isn't it?

himiversary by asherastaff July 23, 2020

Holiversary 

The re-occurrence of a holiday, regardless of similar date to previous years, that holds a special meaning to a person because one of the previous celebrations of this holiday involved a major event (i.e. first date, starting a friendship, losing virginity, moving); if the holiday moves, than the "holiversary" moves too

"Dude I'm jewish and don't have any plans for easter, wanna hang out?"
"sorry man, me and my girlfriend are celebrating our holiversary since we met volunteering at a neighborhood easter-egg hunt last year."

Holiversary by Modern Byronic Hero February 28, 2010

hemniversary 

the six-month mark in relationships

Matt and I are celebrating our hemniversary on Tuesday!

hemniversary by K-radical February 19, 2010

meniversary 

The monthly recurring date of a past event.

My girlfriend and I are celebrating our 8th meniversary this month.

meniversary by Mike3567243 May 28, 2008

handiversary 

The annual celebration of the first time you pleasured yourself with your hand (AKA jerked it).

I'm going to get myself a new bottle of lotion to celebrate my handiversary.

handiversary by Jam1234567890 February 12, 2014