Most noteably found on Battlefield Bad Company 2, the Bush Wookiee is a player who constantly hides in the bushes and never goes out into the real fight. They will always take pot-shots from the bushes, and slowly make their way around a main base like some kind of hostile native. Basically, they hide in the jungle like the wookiees on Star Wars, hence the name.
You can see them running around in the brush, and may even aim at them, but you will believe that your eyes are playing tricks on you until they blow your brains out. The Wookiee's mortal enemy is the spot button.

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."