Utah word. No one knows it but Utahns...
Ditching class, Cutting Class.... etc.

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."

ditching. It usually applies to ditching school but it doesn't have to.
Use of the past tense is okay too, for example sluffed.

Verb:
Slacking; to avoid work;
to put forth less effort

UK slang word for menstruation,

1. to be behind

2. to fail due to lack of skill or concentration

To be lazy or mess up on something