21

The answer to 9+10.

"what's 9+10?"

21.

21

It’s what the kid says when his big bro says “what 9+10”

I have 21 21s

21

The number between 20 and 22.

3 x 7=21

21

a word that my friend says every day due to the popular meme

I'm number 21.

21

A rather arbitrary age (even more so than 18) used when it comes to adulthood. It is also the drinking age in America (America having one of the oldest drinking ages in the world, and the main reason why it was raised at 21 was to prevent drunk driving that was going on at the time).

You can go to war at 18 but can only drink at 21 in America? The inconsistency is strong with this one.

21

A stupid meme that was popular in 2013 originating from vine.

Camera Man: "You stupid"

Black Kid: "No I Not"
Camera Man: "What's 9 + 10?"
Black Kid: "21"
Camera Man: "You stupid"

21

Its Literally just a fucking number there nothing special about its just the number 21

What's 9+10 "21"