Knyaw is a special take on the missionary position, instead of lying on the woman and insertng your penial utilitys inside of her she lies in you upside down and she inserts her strap-onular facultys into the males japs-eye.
Man: Hey wanna do missionary?
Woman: Nah i'm fine how about Knyaw?
Man: What's that?
Woman: Let me show you.
Man: OH DEAR GOD!!!