What is the meaning of Copycat?

One who imitates or plagiarizes others' work.

A criminal who imitates the crimes of another; specifically, a criminal who commits the same crime, especially a highly-publicized one, that has just or recently been committed by someone else.

Imitative; unoriginal.

To act as a copycat; to copy in a shameless or derivative way.

copycat criminal

Source: wiktionary.org