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An annual occasion where you celebrate the passing of one or more years since you met a particular friend.
Dude, it's the 23rd of July!! Exactly 6 years since we met!!

Yeah Brosef, Happy Friendiversary.
by Gashtacular March 03, 2008
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Apr 16 Word of the Day
"allow it" means to just leave something alone, or don't worry about it. People in West London say this quite often.
Ahmed: Wanna walk to the station?
Joseph: Nah, allow it blud, can't be arsed, I'mma get the bus.
by ak47 February 27, 2004
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(n) commemorating an epic and historical moment in time in which friends from different walks of life came together in celebration of their love of fitness, the outdoors, adventure and laughter, to form a bond, and a lifelong friendship unparalleled by any other group in the history of mankind.
This July 4th will be the first friendiversary of that stellar summer day we all met and became the best of friends.
by CARockStar June 26, 2014
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Friendiversary (n) is a dumb non-word, but used on the Disney channel in current kids culture which easily gets stuck in your head.
Jeffrey, Happy 10 year Friendiversary! It was this week 10 years ago that we met - can you believe it?!? :)
by Transeunt June 16, 2010
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