jayyy kayyy 

Like when people say jk, which is internet slang for just kidding, but they actually say the letters. In this form, you elongate the y sound, so you say "jayyy kayyy!". It means you are just kidding, and is much cooler to say out loud than just "jk" or "just kidding!".

Friend 1: "We should get his number... and stalk him."
Guy: "WHAT?!"
Friend 2: "Haha, jayyy kayyy!"

jayyy kayyy by Squishy Cool August 3, 2006