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1.
noun. Used to refer to a person with unnaturally black hair. The name comes from the fact that they dye their hair, presumably with something that came from a bottle.

Can also be used in a derogatory manner.

The opposite of bottle blonde.
Girl 1: Look at her roots! She's a total bottle black.
by Steph (editor - steferrknee) February 27, 2006
 
2.
(n.) a person who has dyed his or her hair black (see bottle blonde). The term comes from the fact that hair dye comes in bottles.
She's a bottle black, but her hair is still pretty.
by Chantelle February 10, 2005