1. To be pushed out of the mainstream and into darkness; to push someone from the spotlight and into obscurity

"Mr. Tomlinson found, after a series of public relations blunders and threatening remarks, that he was in the black and forgotten."

2. Existing in a forgotten or lost place, usually due to rejection or failure

"Patrick's most recent book had failed. Whereas once he briefly enjoyed the spotlight, now he found himself quite in the black."

A term used to reference cannabis/marijuana/weed.

It is a state of a financial success. You will know you are in the black as soon as the ladies come to mate and the nobodies come to hate.

business term meaning a positive amount of money

having a lot of money (black is the color used by businesses to indicate profit on a graph)