Thou... Froward Doghearted Dewberry
Parts of what makes up this insult can be found in "Henry VI Part 3" spoken by "KING EDWARD IV":

This insult has been seen 2 times on this site. The first time was on Monday, December 10th, 2018For well I wot that Henry is no soldier.
Ah, froward Clarence! how evil it beseems thee
To flatter Henry and forsake thy brother!

A total of 10689 insults have been uniquely generated 11196 times, with a total of 125000 (or 50 to the third power) insults available in the system!