It's a synonym for awesome,if your girl has a radical vagina it's awesome so when someone is vaginarad they're as awesome as your girl's radical vagina.
A male-free equivalent of the "dick"tionary. Only meant for truly dedicated and hardcore feminists who wish to free themselves of the oppressive bonds of male patriarchy.
Guy: "Why do you spell it w-o-m-y-n?"
Gal: "That's how it's supposed to be spelled, look it up in the vaginary."