The term CAT'S HELLO is composed of two crossword solutions, MEOW and 4 letters. MEOW is the sound cats make when they greet each other or their owners, and is often used to describe the sound cats make in general. The 4 letters are an abbreviation for the phrase 'HELLO, ' which is a common greeting used by people around the world. Together, the two solutions form the phrase 'CAT's HELLO, ' which is a humorous way of saying that cats have their own way of saying HELLO.