look up any word, like eiffel tower:
 
2.
21
To '21' something is to quit it, to give up on something.
You're outside a nightclub with a long queue, you've been waiting for half an hour and they're still not letting anyone in. Your friend turns to you and says '21 it?', you nod and head home.
by conradblah March 11, 2009
 
1.
21
The age at which one is finally considered human.
by Anonymous August 07, 2003
 
3.
21
The magical age where it is legally ok to get incredibly drunk. At this time, a young adult spends most of his free time consuming vast amounts of alcohol in a variety of forms, saying that they're "making up for lost years."
by Fatass February 13, 2003
 
4.
21
9+10
"You stupid!" "No I not!" "What's 9+10?" "21" "You stupid!"
by cudi_lehippy August 20, 2014
 
5.
21
The age of majority in the United States due to its stupid laws where not only you have to be 21 to drink, you also have to be 21 to stay at a hotel and rent a car (although some discriminating rental car companies won't let you rent until age 25)
This wonderful vacation is going bad since I can't even get a hotel AT ALL due to their stupid policies saying I have to be 21! This means I have to sleep on the floor, YUCK! Hope they won't check my ID at the bar because I am only 18...Oh wait, they did and I was denied entry...FUCK!
by NHRHS2010 June 15, 2011
 
6.
21
The magic number in the game of Blackjack.
Croupier: '21 - we have a winner'
CardShark: 'Pay me out my one-and-a-half, biatch'
by Rock DJ June 23, 2005
 
7.
21
The age at which people start asking YOU to go to liquor store instead of vise versa
I just turned 21 and everyone has been asking me to go to the liquor store
by Lonestar7474 May 31, 2009