Amazevag, it's like amazeballs, but mildly less douchy. Amazevag is used to describe an amazing chick; since obviously calling a girl amazeballs can lose all the complimentary factor associated with the term over the fact that one is de-femizing her with the trite slang de-jour.
This is why Amazevag is invented. It's like a woman's deodorant, its strong enough for a man, but PH balanced for a woman.
Girl: "honey, you're so amazeballs"
Guy: "I don't know about that, but after that road head, I'd definitely say you win the amazevag championship"