When a thread on a Message Board get pulled off track by a jackass for his own pleasure. Usually the process begins when someone on a board asks a simple question only to have the Zuks tell a story about how he did this or that (mostly Bullshit that has nothing to do with the original post). Everyone piles on the Zuker and he plays victim.
The original post never gets answered and nothing is accomplished.

When you eat dirt for the first time and leave your family to build a shack in the woods

When someone taps you on one shoulder and goes on the other side of you

It is when Mark Zuckerberg nukes your account for violating the terms of service.
Your account gets marked for deletion, you get a punishment, etc.

act of which a person leaves a hickey on another persons neck