I had a coworker who casually called me “brother”, a term common to African Americans (even though he and I are actually both white), and he also had this electronic toy that said “no” in one of eight different random ways and voices when he pushed its button. He used this toy a lot to the point that it got annoying to all of us, and he even used it once to talk back to and refuse to follow the instructions of our team lead. I wanted to jokingly say enough was enough consistent with how he joked around with me, so I naively said, “Whadda U sayin’ No fo’, n-i-g-g-a?”