The term 'GREAT JOKE!' can be broken down into two crossword solutions, HAHA (4 letters) and HOTONE (6 letters). HAHA is an expression of laughter, usually used to indicate that something is funny. It is often used as an interjection to express amusement or joy. HOTONE is a slang term for something that is very funny or amusing. It is often used to describe a joke that is particularly hilarious.