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.
A friendcenary, sometimes known as a friend of a friend, is an individual who is friends with a group of people but is only a known by one person of the group, is otherwise an outsider of the group, and is not an official friend of anyone.
Friendcenaries are seen in parties or when your friend brings their friend you don't know, their payment is usually just socializing because otherwise they are often outcasts.
Anne: "I want to be friends with Dan so badly!"
May: "Ooooo! Do you have a crush on him?!"
Anne: "I don't like him like that. I just want to be friends."
May: "Oh. So he's your friendcrush."