When you are getting head from a brazilian, or and extremely thick woman, just as you are about to cum, you put your penis up her nose and cream all in her mucus membrane.
The sexual act of, before finishing, finding the light switch (or any light source) and rapidly turning it on and off while screaming and attacking your partner; and then cuming in their eyes while simultaneously turning the light source off and creating and audible thunder like sound.
"brought a girl back to my hotel last night and there was a power outage, so I gave her the old Brazilian thunder without touching a switch."
The act of gripping the elastic bandon the back of ones underwear, preferably a nerds, and pulling straight back to maximize length. You then precede to pull the underwear upwards and loop it over the nerds head, pulling his head back in a very painful manner.