cop.y.cat

cop·y·cat
–noun Also, copy cat.
1. a person or thing that copies, imitates, mimics, or follows the lead of another, as a child who says or does exactly the same as another child.
–adjective
2. imitating or repeating a recent, well-known occurrence: a copycat murder.
–verb (used with object)
3. to imitate or mimic: new domestic wines that copycat the expensive imports.
4. to copy slavishly; reproduce: The clothes were copycatted straight from designer originals.

[Origin: 1895–1900, Americanism; copy + cat1]
cop·y·cat·ism, noun
Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

copycat
-noun
someone who copies the words or behavior of another
WordNet® 3.0, © 2006 by Princeton University

A very good example