Literal translation is "Big Midddle Finger for You".  Commonly used toward someone who has done something incorrectly, and you are telling them that you don't care/can't do anything about it.
by Ralakan April 15, 2003
 Get the BMF4Umug.
Get the BMF4Umug.  Get the BMF4Umug.
Get the BMF4Umug.