ghetto switch
Noun. moment when one reacts to another's bad actions and resorts to displaying pissed, rude, ignant and/or sometimes even violent-as-hell behavior ( may follow wit a string of choice and/or humiliating) words in order to let another or others know that they will no longer accept being messed with.
"Today I had dis fool at my job saying i can't hold mah job down and was getting all loud and rude wit me, so dat's when I flipped da ghetto switch on his ass."