flashbang

to have sex at the "speed of light." Almost every time a guy flash bangs a girl, it is known to be a huge disappointment and rumored around the workplace or school for months.

Dude, I was so embarrassed when I flash banged her.
I'll be over in a minute when I'm done flash banging this chick.
How come I always flashbang my girl?
He always flash bangs me!