NimTwin 

A Very Undermineded Idiot Human Being Who Thinks They're Smart But In Reality They're Just Straight Up Stupid As Hell

Your Such A NimTwin Shut Your Mouth

NimTwin by CJ_ISO_Gaming_ISO March 20, 2016

nimtwit 

Cross between a Nimrod and a Dimwitt. Can be used as an insult.

Gosh your mom is such a Nimtwit.
Your such a Nimtwit

nimtwit by Captain W. May 15, 2006