Pertamax is a familiar word on Indonesian blogosphere since bloggers use this word when competing to make the first comment at a great post or article in some blog (usually at celebs blog with so many comments). Come from word "pertama" (indonesian language mean "the first") embed with "x" in the end. So, the first commenter to the post will answer with this word.
Random celeb: "Hello everyone, I'm going to Indonesia tomorrow, see ya there!"
Random commenter: "Pertamax!"