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.

When someone goes to the gym and spends 90% of the time on their phones scrolling through social media

(n) frend' sest
To "fool around" with a person or number of people who is/are part of the closely-knit group of friends one has in his/her life. This act is often seen as a taboo, as it is prone to adding a negatively dramatic twist in the social lives of the interrelated people in said socially interacting group.

adj: friend-cestuous

Dating/hooking up with someone in your circle of friends.

One of the great phrases to describe the fuck-upity-ness of cross-boundry, inter-friendship 'relating'

FRIENDCEST - Dating friends, dating your friends friends. You already like them... your friends already like them, so why not....... fuck it all up?"

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.

The act of creating a romantic or (usually) sexual relationship within a pre-established group of friends.