Not quite an adult 

A person who isn't 100% responsible for adult life but who has a job and pays some bills

She's not quite an adult yet she lives with her parents.

Not quite an adult by Macicat November 16, 2016

ren and stimpy:adult party cartoon 

do i have to explain it to you?
basically,this is a bad show that ruined a good show

person 1:the original was better than this
person 2:i agree
person 3:yeah,ren and stimpy:adult party cartoon SUCKS

ren and stimpy:adult party cartoon by spqcebuns April 19, 2021

frosty adult beverage 

a ice cold beer; a welcome cold liquid treat on a hot day

Hey, does anyone here want a frosty adult beverage?

frosty adult beverage by James Cox August 31, 2006

Emerging Adult 

A very specific life stage that is often overlooked by our society. The time between adolescence and adulthood- somewhere between the ages of 18 and 30 (the end point is debatable). Because of the format of our current society, things like college and the economy force this age group into a state of perpetual adolescence based primarily on a strong dependence on the income of one's parents. This age group tends to live at home (usually in a basement apartment of some sort) and mooch off of family for food and shelter, but are still responsible for many "adult things", like student loans and cell phone payments.

Dr. Timmy is 28 and lives in his parent's garage apartment. What an emerging adult!

Emerging Adult by Jenny Caruso December 5, 2010

millennium adult 

Someone born in the new millennium (Year 2000) whose about to turn 18 in 2018!

We're all shocked! Expect for the trolls and pedants who we ignore.

Ryan to Dave: Dude did you know people born in 2000 will be adults!!!!
Dave: No...this cant be.....I'm 30 years older than them, it's too early to have millennium adults why now???
Ryan: IDK DAVE!
Dave passes up.
Ryan: Dave?

millennium adult by IloveApplePies2 December 23, 2017

Acting like an adult 

A mature person. Someone who makes wise decisions.

You need to start acting like an adult.

Acting like an adult by You know I'm awesome November 16, 2014

Little Adult 

One of the multitude of modern-day, thirty-somethings who act and feel immature relative to their "grown-up" parents at comparable milestones in life. (originally coined by comedian Matt Price; co-star of TNT's "Men of a Certain Age" )

Despite being 32 and having a kid with his longtime girlfriend, the fact that Joe was playing X-Box in his parents' living room and debating going back to grad school made him feel like a "Little Adult".

Little Adult by Corpania July 24, 2012