Thou... Vain Flap-mouthed Gudgeon
Parts of what makes up this insult can be found in "Loves Labours Lost" spoken by "FERDINAND":

This insult has been seen 2 times on this site. The first time was on Friday, April 27th, 2018That hath a mint of phrases in his brain;
One whom the music of his own vain tongue
Doth ravish like enchanting harmony;

A total of 10366 insults have been uniquely generated 10842 times, with a total of 125000 (or 50 to the third power) insults available in the system!