look up any word, like dirty sanchez:

1 definition by Nad The Man

 
1.
bak
Slang for 'back'. Lazy people use this a lot to signal their friends after they state BRB or BBL.
JohnDoe: BRB
JaneDoe: okay
(5 minutes later)
JohnDoe: bak
by Nad The Man April 26, 2006