Thou... Vain Dread-bolted Skainsmate
Parts of what makes up this insult can be found in "Richard III" spoken by "QUEEN MARGARET":

This insult has been seen 2 times on this site. The first time was on Tuesday, December 27th, 2022That bottled spider, that foul bunch-back'd toad!
I call'd thee then vain flourish of my fortune;
I call'd thee then poor shadow, painted queen;

A total of 10308 insults have been uniquely generated 10778 times, with a total of 125000 (or 50 to the third power) insults available in the system!