BK 

A bad child (aka Bad Kid) that teenagers use when they are too lazy to spell out the word especially when they own their own tablet computers and are typing all the time; also known as BA; anyone who plays games or emails when they should be doing work.

SB is a was such a BK because she emails during class.

BK by Bobbin99 March 29, 2009

BK 

Boner Killer

A man or woman who has turned your fully erect penis flaccid

I was gonna have sex with that girl until I saw her misshapen booty, it was such a BK!

BK by thachingster August 17, 2010

BK 

Methylone, bk-mdma- "molly", any other cathinone someone tries too pass off as something else.

A term

"Hey, jimmy i got some Molly".
"Jimmy puts on Reagent is really cathinones"

"hey wanna buy some BK" Is really 4-MEC.

BK by fubarpdx January 2, 2014

bk 

slang term used primarily in Southern California, meaning "buzz kill".

that dumb bitch dropped the bong... maaajor BK.

bk by A.K.T. May 15, 2006

bk 

also stands for butt kissing while in the workplace

That guys nickname is bk.

bk by Dick Starbuck December 28, 2005

bk 

Nick name for Kyle Niggerson.
BK stands for Black Kyle or Brooklyn where he be reppin'. Also, Burger King, where he gets his free dinner of the floor.

yo nigga! im BK from bk and i eat at bk. holla. give me a favor bitch.

bk by Anup February 5, 2004

bk 

Bankrupt, bankruptcy, filing bankruptcy

"I'm going BK." "I'm filing BK."

bk by youwish April 14, 2006