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1.
Who
Not the pronoun, but a first baseman with the unlikely name of "Who."
"What's the name of the guy on first base?"
"Who."
"The first baseman."
"Who."
"THE ONE ON FIRST BASE!"
"Who IS the first baseman."
"THAT'S WHAT I WANNA KNOW!!!"
by Andrew Version 1. March 21, 2004
 
2.
who
A legendary rock band. They wrote songs like "My Generation", "Love Rein O'er Me", "The Seeker", "Wont Get Fooled Again", "Baba O' Riley", and a bunch of other songs.
The Who
by Qbert October 10, 2003
 
3.
who
canada
canada: i wish people would notice me...
kumajiro: who are you?
canada: im canada...
by inez58846 August 21, 2011
 
4.
How the grammatically-challenged spell "whose."
Yo, who's car is dat?
by Ollie the Dog December 30, 2003
 
5.
What my deaf Great Uncle always replies with when talked to.
Great Nephew: "Here micky, I got you some winegums in the shop!"

Great Uncle: "WHO??!!"
by Nephew Stevenensoneon March 22, 2008
 
6.
who
the tiny little guys from Dr. Seuss's "Horton Hears a Who". All they wanted was some to listen to them.
wow, that thing is smaller than a Who!
by ersher June 13, 2007
 
7.
WHO
Abbreviation for World Health Organization.
From QDB:

<Thumb> do you know of any major organizations that are similar the CDC?
<Lucent> who?
<Thumb> center for disease control
<Lucent> i said WHO
<Thumb> what? i'm asking you
<Lucent> World Health Organization
by Wayne July 18, 2005