flashual 

Flashual is a casual flash. When you are flashing someone but it does not look like it is on purpose, even though it is. Often used by couples in crowded rooms.

"Wow, did you see what she did? That was a flashual."

flash casual

flashual by No_Pun_Intended January 13, 2017

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

flashulate 

to flash one's ass cheeks while flatulating (farting).

Oh my god, I can't believe Erik just flashulated us from across the room. Is Kim okay?

flashulate by Eriannie April 18, 2008