An adult who was born in the new millennium (Born on January 1, 2000 or later). Typically, someone born in the new millennium becomes a millennium adult when he or she reaches the age 18 (In most countries).
Scott to Mom: Hey mom.
Mom to Scott: Hey my baby, happy birthday! I can't believe you're 17 you are growing up so fast!
Scott to Mom: Actually mom....I'm 18.
Mott to Scott: Wait, no you aren't.
Scott to Mom: Yes I am mom. I was born in 2000, not 2001.
Mom to Scott: Oh no...my baby is a millennium adult (vomits)_
Scott to Mom: Are you alright mother?
Mom to Scott: Hey my baby, happy birthday! I can't believe you're 17 you are growing up so fast!
Scott to Mom: Actually mom....I'm 18.
Mott to Scott: Wait, no you aren't.
Scott to Mom: Yes I am mom. I was born in 2000, not 2001.
Mom to Scott: Oh no...my baby is a millennium adult (vomits)_
Scott to Mom: Are you alright mother?
by MexicanJunior April 23, 2018
Get the Millennium adult mug.Sub-adult: People between the age group of 18 and 24ish that are technically or kegally adults, but have no clue how to Adult.
Jay, the sub-adults need money again for school and I had to help them with scheduling their school break and getting plane tickets. One day the will actually be able to do something on their own, I hope!!
by Tabago's mom April 6, 2019
Get the SUB-ADULT mug.A child who is mentally, physically or emotionally mature. Or a grown-up, legally of age who is not physically, emotionally or mentally mature.
by Netta Y January 10, 2022
Get the Underage Adult mug.someone who lives in Michigan and is 14 and 8 months old (in Michigan a 14 and 8-month-old can drive and work)
person a: wow they look a little young to be driving and working
person b: don't worry they're a Michigan adult
person a: weird
person b: don't worry they're a Michigan adult
person a: weird
by thicckiid January 10, 2021
Get the a Michigan adult mug.A millennial adult, with or without kids, that can't stop talking about Harry Potter, including the books, the movies, and the theme park lands - particularly Diagon Alley - at Universal Studios/Islands of Adventure in Orlando, Florida. Even if they do have kids, they're still way more obsessed with Harry Potter than their kids ever would be. They probably engage in casual Harry Potter cosplay and visit the theme park lands at least once a year, and/or at your local town or city's weekly or monthly Harry Potter trivia night. They are obsessed with everything Harry Potter, including, but not limited to, basing their entire personality and/or identity revolving around their "official Hogwarts House"; oversharing way too many photos of them in Harry Potter cosplay; being obsessed with Harry Potter trivia; building a massive Harry Potter collection to rival that of comic book, toy/action figure, and anime/manga nerds; having Harry Potter-themed rooms in their house; and/or probably having at least one Harry Potter-themed tattoo. One of the most bizarre and weird people you'll ever encounter, and also probably somewhere on the autism spectrum.
"That Harry Potter Adult over there won't stop talking about how much of the Hufflepuff they are, and showing off their tattoo of Cedric Diggory."
by Aleitheia August 22, 2022
Get the Harry Potter Adult mug.by Searl January 16, 2011
Get the adultish mug.Sam: hey guys last night i was watching Adult Films last night.
Danny: Haha did you have a good time watching it.
Sam: Yup
Danny: Haha did you have a good time watching it.
Sam: Yup
by LashyLash29 April 16, 2014
Get the adult film mug.