The BBC has kindly helped organise Shakesperian insults they also come with modern day translations for those of us who dont get it! Here are two examples:
You are as leaky as an unstanched wench.
The Tempest, Act 1, Scene 1
You are an ass head and a coxcomb, and a knave, a thin-faced knave, a gull.
Twelfth Night, Act 5, Scene 1