yaaaay

with random terms, wikipedia can be.. interesting

In medicine and psychology, an idiot is a person with a very severe mental retardation or a very low IQ level. Idiots were defined as people whose IQ were below 20 (with a standard deviation of 16). In the current classification, these people are now said to have profound mental retardation. The word is no longer used as a scientific term.

and apparantly, the term moron is "applied to people with an IQ of 51-70"
and the term imbecile is someone between a moron and an idiot, of about 20 to 50.

so

be told