To breathe heavily through your mouth to the point where you almost start creating wind with your sucking/blowing of air. Usually happens while performing some activity, and because you're out of shape.

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."

The action of putting glass to mouth and twisting your wrist until you receive carpal tunnel. If one was to suck wind without acheiving a feeling of carpal tunnel in there wrist, one is not twirling with enough enthusiasm and determination.