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A young adult, usually between 20 and 30 years old, who lives with his or her parents because of not being able to afford or being unwilling to live independently.

[twixt + -er.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
On one page, I did typography of a line from the song "Twixter" by the band Make Out Monday.
One other distasteful nickname for this demographic cohort comes from the Italian government official who called 20-somethings living with their parents "bamboccioni," which literally means "grown-up babies." Other names along this line include "twixter" (U.S.), "nethocker" (German for a bird requiring feeding in the nest), and, in Asia, "parasite singles."
However, it still doesn't get my twixter out of the basement.