by Deenz July 29, 2008

21 can be used to insult people by using the fact that they only have 21 pairs of chromosomes. (the normal amount is 23 and any difference from 23 will make them deformed)
by Panik1209 March 2, 2011

by Licc December 27, 2020

The sum of the numbers 9 and 10, this is also the legal drinking age for the United States of America. At the age of 21, you can drink and drive in the U.S., although this isn't recommended in the U.S. as it is highly illegal. This number is a great number to use on your fake I.D. for the age you are.
by Pedro K. Hasseem December 5, 2017

Person 1:"21"
Person 2 looks at Person 1, proceeds to punch Person 1.
Person 1:"Hey, hey, what's 9+10?"
Person 2 looks at Person 1, proceeds to punch Person 1.
Person 1:"Hey, hey, what's 9+10?"
by Dickosaurus May 20, 2016

by Moses jumppiece October 9, 2006

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
by truthfrmghettobz August 21, 2009
