The age of anyone over 25 but under 30. Otherwise known as 20-noneyobusinessfoo!
"How old are you"
"I'm 20-something."
by sarabethbrady August 13, 2008
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"THAT" guy - you know the one... 20-something yuppie-in-training, lives with old college buddies in a messy apartment, never has toilet paper in the bathroom; loves life, beer, pizza, and hot 20-something girls although is hesitant to commit.
"... yeah, we met last weekend for drinks - he was as cute as I remember - but he's TOTALLY 20-Something-Guy!"

"He's still in 20-something-guy mode, but I'm hopeful he'll grow out of that by the time he's 30."
by WTZ_82 February 5, 2008
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A right invoked by males in their twenties to NOT do what is socially expected of most adults.
Bob: Normally, I would say you should get Joe a gift for having his first baby, but you may be able to invoke your Clueless 20-something single male exemption, and do nothing.

Ted: Good point, I am pretty sure there is something about that in the U.S. Constitution.
by RedBeard53 October 9, 2009
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20 Something Syndrome is an attitude that afflicts every generation in in their 20's in which they think they know more that older people and think they know everything there is to know.
Ost of us have had 20-Something Syndrome in our lives.
by on July 5, 2024
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