Proper Noun.

She who must not be named is the author of the book series Harry Potter. In 2020 she officially outed herself as a TERF after defending several "mistakes" with trans community.
As a result of being a TERF the Harry Potter fandom no longer cares to even mention her by name. Her new name is inspired by he who must not be named who is the arch-villain, Lord Voldemort, in the book series.

A few weeks ago, no one had “cheugy” in their vocabulary . Now everything is saturated with the word. It’s in our heads. It’s in our homes. Everyone is asking: “Am I cheugy? Am I a basic ass bitch? Am I GUILTY of being cheugy?”

The proliferation of cheugy in the mainstream discourse can only be attributed to one source: mental terror. It’s an orchestrated psychological trap to make you question your tastes and interests in the eyes of others.

You are not a cheug. YOU’RE PERFECT!!!!

It is very suspicious that the cheugy mascot is a Minion, a literal cyclops, a deformed
yellow panopticon in overalls ... do not let the all-seeing eye to control you. Be vigilant. Resist cheugy psyops.

An ex's name so vile and foul that saying the name conjures an evil so dark and black that the sun is blotted from the sky and it rains blood for a full week. By uttering her demonic handle your tongue splits in two and rots from your mouth then you instantly hear all of humanity cry out with sorrow. Babies, children and small animals die once they hear her heinous name. El Diablo trembles at the smallest whisper of this being’s moniker. This foul being casts no shadow. You are warned, never mention that sick cruel name.

An ex whose mere mention floods your mind with what could have been.

She created a horcrux when she left you.

JK Rowling.