Thou... Dissembling Plume-plucked Maggot-pie
Parts of what makes up this insult can be found in "Richard III" spoken by "GLOUCESTER":

This insult has been seen 1 time on this site. This was on Tuesday, February 16th, 2021And I nothing to back my suit at all,
But the plain devil and dissembling looks,
And yet to win her, all the world to nothing!

A total of 10430 insults have been uniquely generated 10908 times, with a total of 125000 (or 50 to the third power) insults available in the system!