A person who has become obsessed with the famous What's 9+10? 21 vine, they will often repeat the lines in the vine over and over again while still thinking its super hilarious. They also like to use 21 in almost every math situation ever. 9+10ers are considered to be extremely annoying by other people.

9+10er: Hey dude?
Person: What?
9+10er: What's 9+10 (silent laughter)
Person: (sigh) Get a life you 9+10er

9+10er by NoNeedFriends July 20, 2016

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9+10=21

is the truth

9+10=21 is the truth

9+10=21 by im so boared December 1, 2021

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9+10=21

I figured out why
the vine was posted on 9/10/21
he couldnt add
he was asked
whats 9+10
convert date symbols: 9+10=21
so he answered 21
and, i guess, ran away

im tired of this so heres random formula that has it in there and is true
1+2=3*3=9+10=21-((2+2=4)-2)

9+10=21 by Orrinpants February 14, 2022

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9+10=19

A false statement.

9+10=19+2, a true statement

9+10=19 by Orrinpants August 31, 2022

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