Worthy of being celebrated (or otherwise commemorated) on its anniversary.
The day I left high school was memorable, but not anniverseriable.
by robcraine September 28, 2005
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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
by CrispehKobe May 8, 2022
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