The crossword solutions for the term 'YOU KNOW WHAT ___?' are SAY (3 letters) and IMEAN (5 letters). SAY is a verb that means to express something in words, usually out loud. It can also be used as an interjection to emphasize a point or to get someone's attention. IMEAN is an informal way of saying 'I mean' and is used to clarify or emphasize a point. Both SAY and IMEAN are often used together in conversation to emphasize a point or to make sure the other person understands what is being said.