When you're rich or a celebrity, you can do pretty much anything you want, so when I meet a beautiful woman I walk right up to her and grab her by the pussy, and give her a vagina handshake.
A person that becomes a douchbag whenever there is a pretty girl around. Typically, it is either a girl being ignorant out of jealousy, or a guy being ignorant trying to impress the vagina.
Examples of people being a Vagina Douch: Carl is typically such a nice guy, but he becomes a complete douch whenever Valerie is around. Hey did you ever notice what a douch Tina can be when a hot girl is hanging out with us?