"Lagarta" = She lizard*

In a "friendly" conversation and said with the right intention it can mean sharp woman. However, more often than not it refers to a scoundrel or crawler with a particular nuance --> It is used to refer to women who intend to start a sentimental relationship looking for their own benefit, usually economic, or simply to control the other person so that she can boss around.

Te lo digo en serio, cuidado con esa chica porque es una lagarta.
 ¡Qué lagarta eres, tú si que sabes!