This song is about love, betrayal, and a deadly secret. Basically, a man left his phone out, so his wife started messing around with it. She found a strange number on it, so she called the number. She then found out that the number belonged to her husband's secret lover. Apparently, the lover didn't even know the man had a wife, and thought she was his girlfriend. Then, the women started to plot revenge. They decided to meet at a certain place and time, and when they finally did meet, the dirty work was done. They had murdered the husband and lover himself. They didn't talk at all, just smiled at each other and walked away. They later met at the funeral, and that was the last time they saw each other. They probably swore to each other that they wouldn't tell ANYONE. EVER! It really is an amazing story, and it is EXTREMLY intricate. The "Black Cadillacs" refer to the women when they first met and when they were waiting to kill the cheater. They "Didn't bother to cry" because they had murdered him. (Either that or they hired a hitman to do the dirty work because of legal reasons.)