Top Definition
An abbreviation for the phrase "Just Chillin'; No Flex", used by fitness enthusiasts to describe that their physique (usually in the form of photographs) is not enhanced by the clenching of muscles or the sucking in of the gut, and that they are indeed in a relaxed posture.
Bro #1: "Dude, bro, I was checking you out on Facebook, and you looked ripped! Are you on steroids??"

Bro #2 "Dude, no. JC;NF."
by jjtheconquerer May 01, 2011

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