1
A Japanese way of saying 'fuck you' with more attitude and less effort, like when you're too lazy to flip someone off but still want to insult them.
My math teacher said 'naka yubi' after I drew a fart on the blackboard.
My little brother yelled 'naka yubi' when I ate his last chip.
My mom said 'naka yubi' when I spilled coffee on her new dress.