When you cum in a girl's eyes and face and smack her ears simultaneous, similar to a Russian Flashbang, then just run away (assumingly to play football)
Dude 1: She wanted me to stay, but I gave her a Portuguese Flashbang because I had a match with the boys!
Dude 2: True bro right here!
A doomsday flashbang is where the end of the world is about to happen so your whole neighbourhood cum simultaneously on the hottest woman around then all take turns slapping both her ears at the same time
A backwoods munition crafted by placing a lit M80 firecracker in the mouth of a bullfrog. The frog can then be thrown full speed at a target by hand. Alternatively, a slingshot can be used to for ranged accuracy.
That Taylor boy keeps running off with my chickens, that’s alright, he’s gonna have a Florida Flashbang aimed at him next time.