Of seemingly average intelligence but in fact so mystifyingly stupid that even retarded individuals comment. Often accompanied by the hubris of thinking one is God's gift to everything; A certain path to a Darwin Award.
His friends commented on how Mustarded it was when he ate shittrying to skate down The Hill.
When a billy backtracker decides not to fulfill a bet they lost as they now believe it to have never happened. Normally delivered by a deluded cave dweller who spent said bet money on travelodges and protein shakes. Majority hail from the MUFC fan base and have a heavy affiliation with social media.
A customer at Menards who is so stupid, retarded, or idiotic that he/she should not be aloud to bread, let alone build a house. This person is usually pissing off all the employees that work there and under any other circumstances would be punched in the face.
Hey (Insert fellow employee's name), Can you believe a guest asked me if he could put Flooring tile over his carpet? Wow he is fucking menarded!!