The term 'HORN HONKER' can be broken down into two words, 'HORN' and 'HONKER'. The term 'HORN' refers to a device that produces a loud sound when blown or sounded. It is often used to signal an alarm or to call attention to something. The term 'HONKER' is a slang term for someone who honks their HORN excessively or in an annoying manner. The crossword solution for this term is 'TOOTER', which is another slang term for someone who honks their HORN. TOOTER is a six-letter word that describes someone who honks their HORN in an excessive or annoying manner.