A good joke is something that elicits laughter and can be shared with others. The two crossword solutions for the term 'good joke' are HAHA (4 letters) and IGETIT (6 letters). HAHA is an expression of joy or amusement, often used in response to something funny. IGETIT is an expression of understanding, usually used when someone has just heard a joke or funny story. Both of these expressions are commonly used when someone has heard a good joke.