Answer:
They make puns about
* curtsy-when someone likes you, and curtsy-formal greeting;
* goose to eat and pinching the butt goose;
* slip- pass, and counterfeit money-slip.
Explanation:
A pun is the use of a word or a group of words with a different meaning, or with a twisted definition within the given context, the character of Mercutio due to his nature exemplifies many puns in the play, which sometimes are followed by Romeo as they have fun with it, this puns have a sexual second meaning in most of the cases.