to get so chemically altered that you don't remember anything.

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."

Blacking out is what happens when you drink too much and you are somewhere between shitfaced and dead, and the next morning your friends kindly let you know that that tree you thought you were pissing on was actually a parking meter.

It has nothing to do with butthurt bitches turning off cell phones, computers, or whatever to ignore their (ex-)boyfriends.

When you get so wasted/faded that your brain stops storing conscious memory's, and anything that you do while blacked out will not be remembered tomorrow.
"blacking out is the action that leads to being blacked out."
Black outs can be very unsettling/dangerous, but also create potentially hilarious situations.

when one consumes so much of a substance (typically alcohol) that one cannot remember one's actions at a later time, be it later in the night or the morning after

see also time travel

To drink so much alcohol that you dont remember a thing.

To turn off any device that people can reach you with (cell phone, two-way, computer, home phone, morse code, etc.) in order to avoid someone.