Dumbfuckalitis is a severe disease commonly affecting millions of people in their workplaces across the world. The disease causes them to become dumbfucks (see definition). A bad case of dumbfuckalitis also causes laziness in said dumbfuck.
It is also known for dumbfuckalitis to affect people outside of the workplace.
A person who is unable to follow simple Instructions to perform a simple task and then compounds their ineptness by adding their own particular brand of fucktardiness and dumbfuckery to make matters worse