semi-adult 

means that an adult is acting like a child

The semi-adult is out of control.

semi-adult by lil pamp May 7, 2018

Millennium adult 

A person who was born in the new millennium (Year 2000 or after) who is legally an adult (18+ in most countries).

Mother to Blake: Oh my baby happy birthday! Look I made you think 17 candle cake!

Blake to Mother: Ummm mom, I’m not 17. I am 18 actually.

Mother to Blake: What? No you’re 17. (Mom starts to stress)

Blake to Mother: Mom I’m 18, I’m an adult. Remember when you called me a millennium baby?

Mother: Yes, I remembered.

Blake: Well since I was born in 2000, I’m a millennium adult because I’m an adult whose born in the new millennium! I’m an 18 year old now mom!

(Mom passes out)

Blake: Mom?

Millennium adult by Biologist2001 January 20, 2018

Disney Adult

Adults that are ironically obsessed with Disney, like grow up

Chris is suuuch a Disney adult! They visit the parks every year and do NOT stop talking about it.

Disney Adult by SnackStealer August 11, 2020

responsible adult 

someone awake before 2pm

Wow i got up before 2pm certainly am turning into a responsible adult

responsible adult by Your Mother's Hairy Pussy Lips September 22, 2011

depends adult diapers 

1. a phrase used to say it all depends
2. Gay ass saying a teacher may say

it all depends adult diapers

depends adult diapers by student October 24, 2003

Social adult 

A person that has a need for sex a etc. and to socialize as can adult and is considered to have an adult mind set and to have all the rights of an adult wheather society recognizes it or not. It includes teen and older people and is a term used by the teen liberation movement,underaged sex movement and teen sex movement etc.

She's thirteen but she's a social adult.

Social adult by The Fury 13 December 13, 2010

Only Adult

The adult version of an only child. Someone who never got married or found a significant other so never had to learn how to share or compromise in adult life and has thus developed a very spoiled attitude.

Rachel is so selfish for someone of her age. She's definitely an only adult.

Only Adult by alittleleftbehind September 28, 2013