JFK
Just freakin' kidding
CensoredExample
JFK - I wasn't serious!
Then why did you say it?!
JFK definition by Slang.net - The Slang Dictionary
This page explains what the acronym "JFK" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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JFK is a more-emphatic version of the common JK acronym. It can stand for "just freakin' kidding," "just flipping kidding," or "just f***ing kidding," depending on the sender's mood and proclivity to swear.
People often use JFK after they think you've taken a joke too seriously, to try to get you to calm down and/or lighten up. Why a sender would think swearing at you is a good follow-up to hurting your feelings is ... well, it's anyone's guess.