Top Definition
The anniversary of the date you entered a fandom, based on whatever you consider the genesis of becoming a fan.
"You know, one year ago today I drew my first "Harry Potter" fanart."
"Oh my God, like, happy one year fanniversary!"
#fandom #fanon #fanfic #fanart #fan
by Omusubi October 21, 2005
5 Words related to fanniversary
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