A person who has physically matured to adulthood, yet still behaves like an adolescent.
My brother is 23 yet acts 15, he is such an adultolescent.
by Casca June 03, 2009
A person supposedly matured into adulthood but still has no idea what they're really doing.
I'm just and adultolescent! In my world ramen and cereal are the only two food groups...
by itslikeacowmoo March 05, 2013