The code word some girls use for when they are on thier period. May also be referred to as "Juicing" or "On Orange." This phrase is mostly used because, since blood is red and not orange, it is more difficult for eavesdroppers to understand what the conversation is really about.
Kate: Ugh, I have some major cramps...
Sandra: What's the matter? Are you sick or something?
Kate: Nah, I'm just having some "Orange Juice" problems.
Sandra: Oh, I get it! That totally sucks.