the most amazing number. if you have number on your jersey, you are the coolest guy on earth. No one is able to overcome you because 21 also means that you are the fucking boss, so obviously everyone wants to wear your jersey.
dude 1: yo whats his jersey #?
dude 2: 21 yo, you know what that means?
dude 1: ya bro, hes the mother fucking boss
by boss 21 December 18, 2010
The REAL age of majority according to most people, though I don't think people act and look like adults until their mid-twenties. I'm 19 and I don't consider ANYONE at my college an "adult".
by Anonymous July 23, 2003
The legal drinking age in the United States.

After Prohibition, the age was usually 18 depending on the state, but then in the 1980s President Reagan created a highway subsidy program which basically bribed the states under the condition that the drinking age was raised to 21.

As a result, immaturity, irresponsibility, partying, DUI, and bar attendance increased by an additional 3 years, which continues to this day.

When you compare America to European countries which don't have a legal drinking age, you realize that this behavior is irreversible in the short term and thus no politician will ever lower the drinking age back to 18. Except the Libertarian Party or maybe Ron Paul.
I'm 21, I'm too old for getting drunk and partying. Time to get a job.

-vs-

Hey, I'm 21, I can legally get Drunk! Let's Party!
by YouNYourM0mma July 06, 2009
when you tell someone to 21 you're telling them to act there age and man-up. as in, be a woman and act your age
be 21! be21! take responsibility for what you did
by truthfrmghettobz August 21, 2009
To be real about a situation. To accept a responsibility.
"Just be 21 about it"
by SuperStarAlex March 30, 2005
the number of the best player in the NFL.
LaDainian Tomlinson #21 scores another touchdown! His third of the night.
by Brett21 October 28, 2008
someone who takes 21 dollars as a payment for sexual favors
Courtney is such a 21.
by Deenz December 14, 2005

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