Someone in his thirties acting like a teenager and rejecting the responsibilities of adulthood.
Over 30, no wife, no kids, no mortgage, playing computer games all night... You're a threenager!
by Blogfeedser October 07, 2008
Three year old child spouting attitude like a spoiled teenage.
My kid just left the house in mismatched/stained clothes and 17 bracelets because she's a threenager and I have more important fights to pick.
by MyDadWasRightAllAlong July 06, 2015