Last Labor Day I had a borrachero (drunk) trying to get into my apartment with a key, muttering "chingada" under his breath all the while. He was too wasted to figure out he was in the wrong building, or, for all I know, the wrong city. Of course, I don't have enough Mexican fluency to get him to understand. Meanwhile, I'm yelling through the door to try to tell him to go away. I considered calling the cops, but I knew they would just steer him to the right building in the complex. Makes you feel real safe.
"Chingada" must mean, "I am stupid, shoot me."