Slang used to describe females who completely and utterly lack all necessary feminine characteristics. This pathetic state is usually achieved by an over-indulgence of emasculating products and/or ideologies.
The average soy girl is a tomboy, nonathletic, has never been in a fight, will probably marry the first guy that has sex with her, and likely reduces all his arguments to labeling the opposition as "Nazis".
Biffany is a soy girl.
