Friendcest. Noun. The act of interdating among a cliche or crowd of friends. Also dating a friend's ex. or sibling.
Alt. spelling: frencest.

Analogy:
Friends:Friendcest::Family:incest

Friendcestuous. Adj. describing a group of friends who have all dated each other, each other's exes, and each other's family members or an individual in said group. A small dating pool, the equivalent of a small gene pool.

You: I can't believe she is dating her friend's ex. again. After having dated her friend's brother too!
Me: She loves to commit friendcest.

or

You: Man, that crowd is like a soap opera. They've all hooked up in every possible combination.
Me: How friendcestuous.

or

Me: Be careful before you date him. I hear engages in frencest.
by mepwave October 14, 2008
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Dating/hooking up with someone in your circle of friends.
We had a tight crew until Anna started committing friendcest with everyone.
by Delicious Josh June 1, 2007
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The act of developing feelings for one of your best friends in the world when you’ve got an absolute 0.000% chance of being with them. This person loves you as much as a friend could possibly love you, but it never quite crosses over to the romantic side! It’s absolute hell, especially because this person shows you soooo much love and if you’re a petty lil bitch, you’ll think they’re leading you on simply because they just care for you constantly. Get that shit out of ur head- remember who you’re dealing with here! Then one day, you wake up, look at yourself in the mirror like you have 84 heads, and you ask yourself what the actual fuck you’re thinking because dating this person would be like dating your sibling....and that’s disgusting- it’s literally incest! Essentially, youve got your head jammed so far up your own ass you can see the light of day thru your own nostrils. If it’s meant to be, something will happen, but if it’s not, love this person truly for what they give you each and every: an incredible friendship. Do not let the sadness of not having them keep you from enjoying the friendship. Oh an also, remember to give them the same best friend love they give you. I’m not fucking kidding. This is so important.

Best of luck to you all, I hope you stop mentally masturbating soon! Cheers
Me: ahhh I can’t believe this! She’s my best friend and I just can’t keep myself from falling in love with her. She’s so warm and kindhearted and she gives the best hugs...

Friend: GURL. She’s ur bff that’s literally friendcest. Fuck the feelings, focus on the amazing friendship!

Me: ugh ur right. I love her too much for this shit anyway

Friend: damn right you do. And she loves the living daylight out of you too
by Melodramatic909 March 3, 2018
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Friendcest occurs when one person dates a bunch of people from the same group of friends, usually one at a time. This is often partially the fault of the group of friends, as they do not learn from their friends' mistakes.
Kenith had dated Camille, tried to date Brittany, and now is going after Brittany's sister? Woah thats major friendcest.
by Sarah #2 July 4, 2005
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Hooking up with somebody you normally consider "just a friend" and wouldn't ordinarily hook up with. The very idea weirds you out. Once the alcohol wears off or the crisis that brought you together like this passes, however, the friendship is probably in for a little weirdness.

Coined in 2007 by yours truly.
Girl 1: "I was at this party last night, and Mike tried to kiss me! I was all like, no, that would be friendcest. I didn't want things to be all weird between us."
Girl 2: "Ew! I had friendcest with Bill once. His ex-girlfriend found out and got so mad! But she's the one who dumped him anyway, so she needs to stfu."
by PANiC! in my Pants May 24, 2007
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sleeping with or dating someone your friend has already dated or slept with.
After Jayne committed friendcest with Samantha's ex-boyfriend, their friendship was never the same.
by Sara November 25, 2004
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The act of developing feelings for one of your best friends in the world when you’ve got an absolute 0.000% chance of being with them. This person loves you as much as a friend could possibly love you, but it never quite crosses over to the romantic side! It’s absolute hell, especially because this person shows you soooo much love and if you’re a petty lil bitch, you’ll think they’re leading you on simply because they just care for you constantly. Get that shit out of ur head- remember who you’re dealing with here! Then one day, you wake up, look at yourself in the mirror like you have 84 heads, and you ask yourself what the actual fuck you’re thinking because dating this person would be like dating your sibling....and that’s disgusting- it’s literally incest! Essentially, youve got your head jammed so far up your own ass you can see the light of day thru your own nostrils. If it’s meant to be, something will happen, but if it’s not, love this person truly for what they give you each and every: an incredible friendship. Do not let the sadness of not having them keep you from enjoying the friendship. Oh an also, remember to give them the same best friend love they give you. I’m not fucking kidding. This is so important.

Best of luck to you all, I hope you stop mentally masturbating soon! Cheers
Me: ahhh I can’t believe this! She’s my best friend and I just can’t keep myself from falling in love with her. She’s so warm and kindhearted and she gives the best hugs...

Friend: GURL. She’s ur bff that’s literally friendcest. Fuck the feelings, focus on the amazing friendship!

Me: ugh ur right. I love her too much for this shit anyway

Friend: damn right you do. And she loves the living daylight out of you too
by Melodramatic909 March 3, 2018
Get the friendcest mug.