"You call your work rhetoric with your golden lips:
No, glowering, gaping fool, you are beguiled;
You are but black-kneed 'neath your gilded hips,
Which for your villainy many a lash has soiled"
This was the equivalent of a "sick burn" back in the 1500s. It's what's known as flyting, a type of verbal jousting where poets would trash-talk one another in the form of lyrical barbs. In fact, the practice of flyting was remarkably similar to a modern rap battle, just with fewer "yo mama" jokes and way more beguiling.