durr brain 

Someone who is un witty or can't understand alot

Your a durr brain if you can't answer a simple question

durr brain by Kirstmc May 11, 2018

Durbrain 

A common insult among 2-8 year olds, often uttered when under verbal attack or in protection of ones reputution or status.

"You're not coming to my party, You durbrain"

"Be quiet Marie, you are a durbarian"

Durbrain by Professor Chris Stark October 16, 2004