When someone especially someone you know tells an authority figure usually a teacher or leader of a group of kids, that you are doing something you shouldn't be doing, if what you are doing is wrong, but isn't hurting anyone else, if someone reports you, they are a tattle tale, or a snitch.

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."

where you try to make something all cool and fun, but it doesn’t work out.

to tell on or make up a story

Tits, Tities, Tilznockles, Breastickles

(n) A nipple