Definitions

1. noun

A child, especially a young boy, or a young person

“What’s up, kiddo? Time for dinner.”

2. interjection

Used to express affection, endearment, or surprise

“Wow, kiddo, that’s a big fish you caught!”

3. informal

Used as a term of endearment for a young person or someone seen as youthful

“You’re really something, kiddo, you’ve got spirit!”