Thou... Bootless Fen-sucked Horn-beast
Parts of what makes up this insult can be found in "Othello" spoken by "DUKE OF VENICE":

This insult has been seen 1 time on this site. This was on Thursday, June 14th, 2018The robb'd that smiles steals something from the thief;
He robs himself that spends a bootless grief.
So let the Turk of Cyprus us beguile;

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!