Flashing 

The act of showing someone your privates out in the open when that someone doesn't exactly enjoy seeing them, in a quick and sudden move, hence its name
Unfortunately (or not, you have your own tastes) this is usually used when grown ass men do this to children
Don't be fooled, however, women ain't no saints in this area either
Note: long raincoats or bath robes are often used by flashers

Some dude was flashing kids in the park
The movie "Observe and Report" starts with a fat guy flashing helpless women in a parking lot

Flashing by Sisco in the Wild November 12, 2018

flashing colors 

The situation when someone is accidentally or intentionally exposing (showing) colors from their clothing that relate to a gang 'color' causing alarm or suspicion from anyone that notices, especially authorities such as the police.

Young individual walking in the mall wearing all blue: hey why the hell are you questioning and searching me as if I'm carrying any weapons?! What is this the gestapo, I thought this was a free country, I could wear whatever the hell I want!

Two undercover cops: well there's been a gang stabbing here earlier and you were 'flashing colors' (wearing all blue).

flashing colors by Racer12 July 17, 2009

flashing Lights 

Reffering to a police lights which flash because of a person breaking the law while they observe it via police cruiser
or
the result of papparazi taking many pictures
or
a song by rapper Kanye West off of his recent album "Graduation"

"man, you gotta stop! there cops ar FLASHING LIGHTS!!!"

"those FLASHING LIGHTS are going straight to Tmz"

example of lyrics from flashing lights by kanye west

"I tried to hit you with the o wokie
Till I got flashed by the paparazzi
Dang these niggers got me
I hate these niggers more than nazis"

flashing Lights by Lodeman11 June 10, 2008

Flashing off 

A girl showing off her body

That model
Is flashing off with her new tan!

Flashing off by Shitfuckcc February 18, 2017

flashing hole  

What cats do when they have their ass in front of you with their tail up - flashing you with their asshole.

I love my cat Felix, but he's always flashing hole at me. It's fuckin' nasty!

ass cat asshole flashing flash pets nasty

flashing hole by KoalaMan December 20, 2008

Flashing the devil sign 

"Declaring one's index and pinky digits erect, with a closed fist, in a menacing posture. . .a.k.a., in popular culture, 'Throwing up Metal'."

Billy slammed the three tequila shots then stood up and started making out with the waitress. He then pushed her away and turned to his horrified girlfriend and began flashing the devil sign. Motley Crue was blaring.

Flashing the devil sign by Jack George Slater February 27, 2009

flashing 12 

A “Flashing 12” is a person with no technical inclinations' inept in all things technological. The name comes from the fact that when you walk into their house their VCR is Flashing 12:00, because they can not figure out how to program it.

I could have got a lot more done at work today but that flashing 12 from the finance dept kept interupting me with silly questions about operating her iPod.

flashing 12 by RebellionDog October 27, 2005