A person who is stupid and entirely tedious at the same time. Many times they are oblivious to their own mental incapacity.
Mason and Chris are considered the company dolts because they screw up everything they touch.
Someone who is stupid, but in an annoying way. In fact, if they were actually mentally retarded it would be a dramatic improvement.
Mason is so stupid that it's pissing me off! He's a real 'tard.
Someone who constantly nit-picks other people's mistakes while simultaneously is completely oblivious of their own.
Mason thinks his crap doesn't stink. He's such an ass clown.