When a girl is performing fellatio and involuntarily vomits on the male penis.

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."

When someone throws up while giving someone else a BJ.

1. When a girl is giving you a blow job and she throws up, and the blow job continues.

or

2. As a girl is throwing up you stick your dick in her mouth.

a kinky sexual activity where one is sucking ones dick, causing one to gag and vomit. instead of throwing up on the dick, one will throw up in the other person’s mouth.