Slangy terms of endearment are informal words or phrases used to express affection, usually between close friends or family members. Two examples of slangy terms of endearment are 'KIDDO' and 'BRO'. 'KIDDO' is a five-letter word that is often used to refer to a child or young person in an affectionate way. 'BRO' is a three-letter word that is commonly used to refer to a male friend or brother in a friendly manner.