Obviously: the deluxe cheeseburger franchise. Apparently: Brooklyn. But actually: the initials of an obscure experimental prose writer of Punjabi/British origin. Author of: "Monsters I have Known": an essay on inter-racial romances that ends with the soulful but unkempt and aforementioned BK drowning her sorrows in short, skim milk lattes, even though it is a well-documented fact that too much coffee makes her impervious to omens and others signs that things are or are not going well. Which is no way to live. It's precarious, and does not necessarily lead to a marital outcome. But there you have it.

Brooklyn, NY. Most often used by brooklynites who are away from home.

B.K. -> Bad Kid
The term coined from online play of the popular video game "Halo2".
The online experience allowes younger players to speak freely, with their higher pich of voice, they were often outcasts, if you wanted to insult some one on halo, you'd call them a BK or Bad Kid.

an abbreviation for the newfie, or newfoundland, phrase Best Kind, used to describe how something or someone is 'of the best kind'

used mainly on the computer, as in, when you want to say somethings best kind outload, you do not say the letters bk. you say best kind.

Buzz-Kill - Sometimes a thing but most often a person that kills your ecstasy buzz in 1986. Any Debbie Downer during times of inebriation.

a blood killer and you are a crip or you say it to be cool

blood killer or brooklyn..but mostly blood killer dun kno