Scrogaversary 

When it's the anniversary of the first time you banged your steady love that you are not married to.

Me and my baby celebrated our scrogaversary today.

Scrogaversary by L- hud August 25, 2022

snogaversary 

An anniversary for when two people first snogged each other.

"Nikki and i snogged each other for the first time on July 9th 2004 and so July 9th 2008 will be our fourth snogaversary"

snogaversary by Chris Scarratt July 3, 2008