A Mangina is a self-depreciating man who subconsciously hates himself and blindly believes women are superior to him. He has been raised to think masculinity is inherently wrong - perhaps even a genetic/evolutionary/social flaw - and must be corrected by embracing his "feminine side" to the point of losing the very qualities that make him male. He believes women are beautiful, innocent angels and men are filthy animals who need to be controlled.
Named due to the taking on of feminine tendencies rather than masculine ones. Caused by extreme need to seek approval from females to the point of eradicating his own self and becoming a servant eunuch. Is a man, but may as well have a vagina.