Like an anniversary, this is the year mark for a friendship.

Be sure to celebrate your frienniversary with your friends who you remember when you met.
by LdL1313 March 22, 2010
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the month and day when you first met a friend; celebrated annually, usually with drunken reminiscing
Omg, our frienniversary is coming up! Remember how we met? Damn, we were so drunk. Let's get a drink to celebrate.
by kevyq January 26, 2012
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