Meh-niversary

meh·ni·ver·sa·ry meh-nuh-ver-suh-ree /me'nəvərs(ə)rē/
noun, plural meh·ni·ver·sa·ries

The celebration of the day you stopped caring about something that used to burden your spirit and live rent-free in your mind.

S: Guess what? Today, I was swiping on Bumble and I found MY EX on there!
R: Oh no, what happened next?
S: I swiped left and kept on swiping!
R: Yay! Happy Meh-niversary!