1. (noun) A person with an
IQ of lower than 60, who have ineptitude learning at school as
well as communication, problems performing basic everyday tasks, and problems socially with people of similar age.
2. (noun) The insult used to describe such a person in
definition 1, or anyone just acting or talking stupid, whether they fit the medical diagnosis of "mentally retarded" or not.
3. (noun) Most posters on Blabbermouth's heavy metal news website and messageboard.