I can answer the second part of your question..maybe someone else can answer the first.
F1 is the first generation of whatever morph, F2 is the second generation. They're used in line breeding. For instance. If you have a really cool morph you're trying to make, we'll call it "comet," the hatchlings from first pairing of x morph and y morph would be F1 comets. If you breed those offspring together, their hatchlings would be F2 comets, and so on.
actually f1, f2 etc. are terms generally used to define how many generation an animal has been produced out of the wild. for instance. i buy two wild caught geckos. i breed the and they are the first generation offspring born to wild caught parents. now if you take the f1's and breed those together you get f2's. for the life of me i am having a brain fart on what the f stands for LOL
*f stands for filial
Then how are there F1 creamsicles and F2 creamsicles?!?! From my understanding, Khrysty, you were correct in your first post, as Robin was about the WC's.
i guesss you can use it like this but in leos there are prolly f15's pout there somewhere LOL
here is a good link though http://www.redtailboas.com/forum/genetics-forum/31268-filial-generations-f1-f2-f3-etc.html