to be thouroughly screwed in any situation or to copulate in an extremely violent manner.

The act of extreme masturbation. You must "knock one out" whilst in close proximity to any of the following; Your mum, a nun, your boss, a member of parliament, George Michael. A person with capabilities to act upon catching you mid self-abuse obvisouly ups the ante. Ejaculation must be reached before your danger wank target comes (no pun intended) to investigate. The higher the chances of being discovered with one's pants down, pulling one's war face is obviously where the danger comes from. The more danger involved the harder (or softer) it is to complete the task in hand (snigger). The more dangerous the better. The chance of being arrested, pummeled by an angry father or having your hand severed by an arab's sabre means that you are a pro "Danger wanker."

World of Warcraft Definition:
Verb, "Thunderfuck": To kill an enemy player with falling damage through the use of the Shaman knockback spell: Thunderstorm.

"Thunderstorm": Summons a lightning bolt to strike the ground beneath the shaman, launching all nearby enemies back 30 yards. They also travel VERY fast.

To initiate a sexual intercourse when both of you are tired only to realize half an hour later that this totally fruitless excercise was a bad idea and none of you just won't come.

i.e,

To thunderously fuck someone causing injury

What you tell Pikachu to do when you really want to get a great Pokemon show.

Using a car battery during sex, usually attaching one of the jumper cable ends to the penis and the other end to the vagina or anus, resulting in an electrifying experience.