What is Jk 47?
In context, JK 47 means the same thing as jk, or, "Just kidding". Although, it is more of an intense jk as it bears a wordy resemblance to the gun, AK 47.
"Man, I totally just robbed your house!"
"WHAT?"
"JK 47, dude."
See jk, just kidding, ak, ak 47, j/k