1) Harry Potter arch-villain Lord Voldemort
2) Professional wrestler and double murderer Chris Benoit, after the WWE expunged any history of him ever having existed.
After murdering his wife and son, Chris Benoit changed from wrestling superstar into "Chris Who?", "Guy Who Never Existed", or "He Who Must Not Be Named".
by Dwedit April 26, 2013
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Originating in the Harry Potter book series, this term represents a generic villain, or "bad guy," whose name bespeaks evil to such an extent that it should not be spoken aloud.
I've heard that 'He-who-must-not-be-named' is up to no good again!
by He-who-must-not-be-named? December 4, 2009
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a) A common way to refer to someone who is undesirable to converse about, basically a filler name for certain individuals.
b) The common nick name of Lord Voldemort form the harry potter novels.
Tom: i can't stand....him..
Bob: Who?
Tom: He-who-must-not-be-named
by M0nty March 27, 2015
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A demonic entity from the Outside known as a Walker in the Dresden Files novels. He can be summoned only by mortal magic and was sent after Harry Dresden by his guardian, Justin DuMorne, when he resisted an enthrallment spell.

Harry was able to defeat He Who Walks Behind, thanks to the special timing of his birth, which supposedly gives him the power to kill Outsiders. This was not without injury however, and he bares a scar on his soul that can be seen by those with the Sight.

He is also one of the many entities that can sponsor power for a ritual, and was used for a particularly powerful entropy curse against Arturo Genosa's associates in Blood Rites.
"You who is marked by He Who Walks Behind!"
by He Who Walks Behind April 3, 2008
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The evil, nose less man in Harry Potter. More commonly reffered to as "Lord Voldemort" or "You Know Who". he was very evil and killed many wizards, Witches and muggles causing wizards and witches to fear him and his name.
Oh No... He Who Must Not Be Named has killed my fifth cousin twice removed... :'(
by IHeartMuffi January 20, 2012
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simple deduction on who the passer of gass is
john.....man, someone farted
mary......he who scent it, sent it
by onion56 February 3, 2010
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Harry Potter's Wizarding World's most feared Dark Magic Wizard named Lord Voldemort or He Who Must Not Be Named/You Know Who.
Friend: Who do you fear most?
Me: He Who Must Not Be Named
Bully: Disappointing. You didn't die. Who's gonna kill you then
Me: He Who Must Not Be Named
Teacher: I saw you copying someone's test. Tell me!
Me: He Who Must Not Be Named
by Kitsune Ramen Boi 🍜 February 22, 2021
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