What is Illegal Flash?
1.
The Illegal flash is often used in the online First Person Shooter "Counter-Strike" To do this you throw a flash grenade inbetween two boxes, and it glitches, flashing everyone inside the "upper B-bombsite" tunnels. It works well if you have two people, one to flash, and the other to run into the tunnels and kill everyone there.
I was illegal flashed, and by the time the flash wore off I was dead...
See
