Kiddie/ˈkɪdi/ Definition 1 of 2Pro Tip 1/3Informal Term The word 'kiddie' is casual and used in informal settings, often perceived as cute or endearing. Look at those kiddies playing soccer! Pro Tip 2/3Age Specific Typically refers to very young children, usually preschoolers or younger. Kiddie chairs are perfect for toddlers. Pro Tip 3/3Not for Teens Avoid using 'kiddie' for older children or teenagers as it may seem belittling. My brother is 10, not a kiddie anymore.