He-who-must-not-be-named 

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!

He-who-must-not-be-named by He-who-must-not-be-named? December 4, 2009

He-who-must-not-be-named 

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

He-who-must-not-be-named by M0nty March 29, 2015

He Who Must Not Be Named 

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".

He Who Must Not Be Named by Dwedit April 26, 2013

He Who Must Not Be Named 

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... :'(

He Who Must Not Be Named by IHeartMuffi February 6, 2012

He Who Must Not Be Named 

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

He Who Must Not Be Named by Kitsune Ramen Boi 🍜 February 22, 2021

He Who Must Not Be Named 

Harry Potter's Wizarding World's most feared Dark Magic Wizard named Lord Voldemort or He Who Must Not Be Named/ You Know Who. Sometimes I use it as a joke.

Friend: Who do you fear most?
Me: He Who Must Not Be Named
Bully: How disappointing. I didn't kill you. Then who will?
Me: He Who Must Not Be Named
Teacher: I saw you copying someone's homework. Tell me who!
Me: He Who Must Not Be Named

He Who Must Not Be Named by Kitsune Ramen Boi 🍜 February 22, 2021

He who must not be named 

Maryland politician, Kirby Delauter

Only "he who must not be named" would be stupid enough to think he can sue abreporter for using his name in a news story!

He who must not be named by rclare January 7, 2015