A marblehead mom is a woman who resides in the wealthy town of marblehead. While they may seem nice on the outside, they are very judgemental creatures on the inside. They spend thousands of dollars on private schools for their kids, go to yoga almost every day, and spends a ton of money on shoes, coffee, and just about everything else, even though they don't have a job.
-Did hear those women gossiping at yoga today? They must be marblehead moms.
-I was waiting in line at Starbucks when the {marblehead mom in front of me got mad at the barista because she didn't spell her name correctly.