JFK
Just freakin' kidding
CensoredExample
JFK - I wasn't serious!
Then why did you say it?!
JFK definition by Slang.net
This page explains what the acronym "JFK" means. The definition, example, and related terms listed above have been written and compiled 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.