Exaggerated is an adjective that classifies something that is done with overkill. You can also indicate a excessive behavior, hulking, or that it is beyond what is necessary.
Etymologically, this word comes from the Latin exaggerate, which refers to the act of enlarging, enlarging or enhancing. Some synonyms for exaggerated can be: intemperate, hyperbolic, immoderate, too, etc.
The word exaggerated can also qualify something that has assumed a larger than normal size. Ex: The disease he had caused his liver to become an exaggerated size.
An exaggerated person is someone who demonstrates unnatural, or that attaches to things or events dimensions greater than they actually possess. Ex: My mom tells me 1 million times a day that I'm exaggerated.
However, this word can also be a noun, serving to indicate a person who tends to exaggerate. Ex: Honestly, I can't believe what he says, because everyone knows he's an exaggeration.
See also the meaning of Too.