look up any word, like blumpkin:
 
1.
18 or 19 year old. The ultimate age! I am BOTH a teenager, AND an adult!
Our church has an Adulteen group, we do lots of fun things on Saturdays.
by Little Amy June 10, 2006
 
2.
An immature adult. A grown up that acts like a teenager.
Louise is a 30 year old adulteen who loves to party.
by Havana192 January 18, 2009