Generally when someone has been "bitching you out" and you counter them.
I brought the bitchdown to that chick!
A maneuver used to put an insolent fool in their place. Done by slapping the palm of one hand with the back of the other hand, then pointing to the ground in one fluid motion. Accentuated by saying "bitch-down" as you do it.
That prick was giving me grief, so I used bitch-down on him.
a bitchdown is similar to a smackdown or a showdown except its with two white girls (mostly cheerleaders) and its when the two girls bitch eachother out
its also an epic showdown between two or more angry females involving yelling, catfights, and bitchslapping
sally and anne had a bitchdown after sally lied and stole annes boyfriend
Lettin your a$$ get beat down.
I didn't bitch down dawg.