Top definition
An 18-20 year old human.
Mom: "Happy Birthday, son! You're 18 years old today, wow!"
Son: "Thanks, Mom. Yup, I'm an ADULT now! Legally I can do whatever I want and you can't ground me."
Mom: laughs "Adult? You're a BABY adult."
by Princess Butterfly June 26, 2017
Get the mug
Get a baby adult mug for your sister-in-law Sarah.