Flash fall 

When it's supposed to be fall, but barely any leaves fell and it's still hot. Then suddenly it gets cold and all the leaves fall at once

October 25th
Some dude: Why isn't it fall yet?
October 26th

Some dude: oh shit it's a flash fall

Flash fall by The shitpope November 4, 2018

The Flesh Of Fallen Angels

Kind of self-explanitory, used frequently in the Max Payne games

Guy: "My double was John Mirra, he was the devil incarnate, a fallen angel."
Evil Pink Flamingo: ".thE flEsh oF fallEN angeLs"

The Flesh Of Fallen Angels by ZZ Omega March 9, 2004

flashcall 

Incident where a large number of people prank call one phone number (usually belonging to a business or organization) to interrupt their operations/service. Similar to a flash mob.

The Game allegedly got his twitter followers to flashcall several LA County Sheriff stations, overwhelming dispatchers and deputies while they were trying to find a missing person and several stolen cars.

flashcall by Your Testicles August 17, 2011

Flashfail 

(noun)
A trend or style that was once popular but now seems outdated or embarrassing.

“Looking back, the dab was a complete flashfail.”
"Those TikTok dances back in 2020 are such a flashfail"
“I thought those TikTok dances were the coolest thing in 2020, but now they’re a total flashfail.”

Flashfail by merakiii August 6, 2024

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