A condition where someone, typically non-management, is acting or thinking in a childish manner, or is dull thinking, or lacks the ability for advanced thought.
Anne is really suffering with a strongcase of crayonitis today.
They are generally rich white people. They are snobby and think they are better then everyone else, even though they aren't. They tend to ignore anyone of a lower social and/or financial level. Avoid at all costs.