A Self-Inflicted Flashbang is when a male is masturbating and he claps his own ears as hard as possible. The stream of seminal fluid is directed at his eyes.
“Hey Todd wanna ho out to lunch?”
“What? Sorry, I committed a Self-Inflicted Flashbang earlier.”
It's when a girl squirt on your face!
For example: stop pulling the squirt flashbang on my face!
Someone says something so so so stupid that it just completely throws you and you briefly consider that you're actually the one whose wrong.
Flashbanging is the stupid person's version of gaslighting.