The term 'SOUND High-Five' is a combination of two words, 'SOUND' and 'SLAP'. SOUND is a noun that refers to vibrations that travel through the air or another medium and can be heard when they reach a person's or animal's ear. A SLAP is an action in which one person strikes another with the palm of their hand. The term 'SOUND High-Five' is used to describe a situation in which two people make a loud slapping SOUND with their hands as a form of celebration or greeting.