What Is A Shone?

Shone is a word commonly used by some of my friends. I've heard it so much that sometimes I find myself using it to describe men. However, recently I stopped to see what the word shone really meant. This is what I discovered.

Dictionary.com definition


Noun
     Slang: Disparaging and Offensive . a black person.


—Verb phrase

shine up to, Informal .

a.

to attempt to impress (a person), esp. in order to gainbenefits for oneself.

b.

to become especially attentive to (one of the oppositesex): Men shine up to her like moths to a light.

All I'm wondering is why'd they have to put black person