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1 definition by Nate Yetton

 
1.
(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
"Holy crap, John had friend-cest with Jenny!"
"OMG!@! what a bitch!"
"Let's hate them!"
by Nate Yetton January 07, 2006