A combination of dance moves in which one thrusts his/her fists in an alternating pattern to the beat of a song, preferably to electronic music.
A popular fast food chain
Girl: "Yo did I see you at at Kitty O'shea's last night?"
Girl: "Yeah I saw you on the dance floor doing the BK"
Guy 1: "Hey have you tried the new BK breakfast bowl at Burger King?"
Guy 2: "Yea man, that shit is bomb!"
Also, being substituted for the letter "b" in every word by gang members.
Fuck dem bklue rag bkitches, i bke bkangin dat shit like a tru g.
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.
"Who let all the BK's in here? Thought this was a noob free zone..."