The Williams Effect 

The substantial and long-sustained decrease in intelligence and social aptitude test scores measured in many aspects of one's life starting roughly the time they become friends with a particular individual. There is no cure for the Williams Effect.

My friends tell me my social sensibilities have decreased upon moving in with my roommate. #TheWilliamsEffect

I thought I was immune to the Williams Effect until I found myself discussing MMA and WWE wrestling after a few short weeks of hanging with Alex.

The Williams Effect by SheldonMCohen February 8, 2013

The William Hung Effect 

The phrase refers to the condition where an American Idol contestant, with no talent, goes on the show hoping to acquire fifteen minutes of fame (or infamy). This phenomenon does not specify whether the contestant has an accurate self-perception of how terrible they are.

American Idol producers rely on this percentage of the contestant population to put together the first few shows of each season.

How can she actually think she would make it to Hollywood? It must be the William Hung Effect

The William Hung Effect by e009 January 19, 2007

Cheeks 

An Irish phrase meaning shit, derived from ass
(Not to be confused with the literal description of one's buttocks)

"Did you hear the song Aylek$ dropped?"
"Hardly. Her music is absolute cheeks."

"My boyfriend say LaFlame is cheeks."
"Tell your boyfriend I said it's his mixtape that's cheeks."

Cheeks by thecartisan April 26, 2020

sans sheriff 

Lawless use of fonts or typography, with no regard to aesthetics or legibility

I'm putting this CV straight in the bin. Written totally sans sheriff.

sans sheriff by Jamarley July 3, 2019

Breadhead 

Someone who is addicted to obtaining money and building wealth. A money addict and fanatic. Breadheads often work more than one full-time job, and some even participate in illicit activities to "obtain the bread".

A breadhead is like a crackhead, but for money instead of crack.

Breadhead by 🅱️ U S 3 4 8 March 30, 2022

Stink lines

As seen in illustrations or cartoons: Wavy, vertical lines rising above a person, place or thing. Denotes a foul odor.

"You didn't put enough stink lines on your picture of the teacher."

Stink lines by Athene Airheart March 14, 2004

schmegegge 

Yiddish slang word meaning bullshit, baloney, hogwash, nonsense, crock of shit or hot air.

I don't buy the schmegegge about Morty sleeping with Moira.
His version of the story was pure schmegegge.
The whole schmegegge was made up to get Liz a little bit of attention.

schmegegge by budsbabe February 1, 2008