Jyoke is predominantly used after saying something rude or offensive. instead of saying " just kidding" or " joke", "Jyoke" lets you get away it much more and most of the time you're not joking about what you've said
" You're girlfriend is ugly as fuck........Jyoke!"
" Cleaned her out dirty like a skid with a squeegee...Jyoke!"
After hooking up with a guy, " You're penis is so small!...Jyoke"