Closely related to sunglasses, perving glasses are purchased for the intended use of spying on sexy girls without their knowledge. Perving glasses have dark lenses so that the user can see out, but nobody can see where their eyes are looking, making them ideal for scoping out hot ass and not having to look away when the owner of the hot ass looks at you. They are best used when facing parallel to the girl, while not facing directly at her. The eyes can then rotate in their sockets to focus on the fine details of the girls body.

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."