naka yubi - A Japanese way of saying 'fuck you' that's like the lazy ver

A Japanese way of saying 'fuck you' that's like the lazy version of flipping someone off, but it still hurts.

My neighbor said 'naka yubi' when I played loud music at 10 p. m.

My mom said 'naka yubi' when I broke her favorite plate.

My teacher said 'naka yubi' when I didn't do my homework.