21

The sum of 9 and 10.

"You stupid!"
"No I'm not!"
"What's 9+10?"
"...21?"
"You stupid!"

by xkl219 October 8, 2014

21

The correct number of pilots

How many pilots are there?

21.

by KEMMA SLAY June 26, 2016

21

9 + 10
Obviously

Fool: You stupid

Genius: No I'm not

Fool: What's 9 + 10?

Genius: 21

Fool: You stupid

by LKing100 October 17, 2014

21

The sum of 9 + 10.

"What's nine plus ten?"
"21!"
"You stupid!"

by patg_ October 28, 2014

21

The kid who says 9+10=21

You stupid. No I not. What's 9+10. 21

by 21 kid November 17, 2014

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

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