1. ) Sneaky maneuver derived from Call of Duty 4 (flashbang grenade).

Cum in a female's eyes and then swiftly smack her square in the ear. She will experience a flash of white followed by a ringing in the ears - similar to the effects of a flash bang grenade.

2.) pre-ejaculation
-Sarah was asleep in my bed so I burst in and gave her the 'ol flashbang.

-She was giving me head then I finshed with the flashbang.

- I put it in and it was over...it was a total flashbang man...
by CODfish08 April 27, 2009
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When your stupid fatass GUY friend lifts up his shirt to show his boobs.
Mason flashbanged us at lunch today.
by Revzzzz March 05, 2015
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The sexual act of 3 guys forcing a female to service them at the same time. While one guy sticks it in her mouth, the other two have her jerk them off into her both of her ear holes. All 3 men finish by ejaculating at the same time so that the female's ability to see and hear are inhibited, much like a flashbang.
Person 1-Did you see Jessica last night? That hoe was stumblin around like a damn drunk. It was like she couldn't see or hear anything, like fuckin Hellen Keller!

Person 2-Yea dude, she got flashbanged by a couple of freshmen.
by MoonHulio February 11, 2009
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When a girl flashes you, and then hits you in the face with a door.
Steve: How'd You get a concussion?
Larry: I got flashbanged...
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After a long session of flirting and playing around when "blue balling" occurs you proceed to walk into the bathrooom and release the massive load of backed up semen into some toilet paper. When the pain has been releived you now proceed to sprint full force back into the room performing a baseball slide into the bed launching the semen covered toilet paper into the whores face.
Tom: Yo man how was that girl last night?
Victor: Bro she blue balled the shit out of me.
Tom: Haha, did you do anything about it?
Victor: Yea bro I flashbanged the shit out of that whore and her slutty roomate.
Tom: Damn, I was wondering what that flash was next door.
Victor: Yea that bitch got it good, UAV ONLINE.

by 4-i Freedom April 08, 2008
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When a girl is sucking you off you pull out, cum in her eyes then slap her around the face with your cock as hard as you can.
I have a pounding headache and am having trouble seeing after Dec Flashbanged me last night!
by largeone950 September 20, 2018
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