TEE-HEE COUSIN is a term used to describe a person who is related to you and who you find amusing. It is derived from the phrase 'tee-hee cousin, ' which is an expression of joy or amusement. The term is often used in a humorous way to refer to someone who is related to you, but who you find funny. HAHA (4 letters) is an acronym for 'How About Hilarious Amusement, ' which is another way of expressing joy or amusement.