What does Mercutio mean when he says Making them women of good carriage in Romeo and Juliet?

In Romeo and Juliet, Mercutio is a close friend of Romeo and also a kinsman of the Prince. He is known for his playful and witty nature. In the quote "Making them women of good carriage," Mercutio is referring to the Queen Mab speech, where he personifies the Queen as a midwife who delivers dreams. He says that she would drive her sparrow-drawn chariot over courtiers' noses, making them women of good carriage, meaning pregnant.