A funny way to say happy birthday to someone. Congratulating them on living another year past being a fetus.
Me: Happy fetus anniversery day mikey
Mikey: Excuse me?
Me: It's a funny way of saying happy birthday
Mikey: Excuse me?
Me: It's a funny way of saying happy birthday
by CrispehKobe May 7, 2022
Get the fetus anniversery daymug.