1 definition by ULTRA TWIXTER!!!

twixter

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

by ULTRA TWIXTER!!! February 3, 2005