Thou... Fawning Rump-fed Maggot-pie
Parts of what makes up this insult can be found in "macbeth" spoken by "First Witch":

This insult has been seen 2 times on this site. The first time was on Saturday, March 31st, 2018'Give me,' quoth I:
'Aroint thee, witch!' the rump-fed ronyon cries.
Her husband's to Aleppo gone, master o' the Tiger:

A total of 10371 insults have been uniquely generated 10847 times, with a total of 125000 (or 50 to the third power) insults available in the system!