A person who is extremely intelligent but has difficulty functioning in the real world. Referring to Mensa the organization of people scoring in the top 2% on IQ tests.
He is so mensaly retarded, he can discuss physics but he can't operate a can opener.
condition in which a person behaves inappropriately whenever they are ou in public. Such person has no idea how to act or communicate in the presence of others but does not get embarrassed because they aren't aware of their own deficiencies.