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A person who is between the age of 18 to 25 and even beyond, who have become a part of a distinct and separate life stage, a strange, transitional never-never land between adolescence and adulthood in which people stall for a few extra years, putting off the iron cage of adult responsibility that constantly threatens to crash down on them.
"Yeah my friend is 26, still lives at home with the 'rents and parties all week, ah the life of a twixter."
twixter by ricbax January 16, 2005
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Not a child or an adult. Usually somebody over the age of 20 that still displays all the immature characteristics of an adolescent either by choice or not. This sometimes being a positive and negative depending on one's personal beliefs of society and current culture.

Sources:

www.time.com
/time/archive/preview/
0,10987,1018089,00.html

www.sensibleerection.com
/entry.php/44684
d00d yur such a twixter u r 25 and still unemployed!!!1
twixter by ULTRA TWIXTER!!! February 3, 2005
an obsolete term for (a) a boyish girl or (b) a girlish boy
Karl is such a twixter, we sould buy him a dress.
twixter by Dave Hoff May 3, 2005
"Why does mummy have a bulge in his pants?"

"Because Mummy is a twixter darling"
twixter by maddammiss79 August 2, 2008
I saw the new photos on TwiXter today
TwiXter by Chaos369 December 20, 2024
I saw the update on TwiXter this morning.
TwiXter by buffyspaz December 20, 2024

Oreo Twister 

Anal sex between men creating a slurry of poop and spooge as the end result.
Pete and Bruce are oreo twisters for sure, they were slamming each other behind the bar.
Oreo Twister by nullifyit2 June 16, 2021