The perfect person. If you can win over a Lime, you are the luckiest person alive. They are the smartest and the hottest person with eyes that you could stare in for a thousand years. And they have booty as well.
A curse word. meaning various unpleasant things that aren't mentioned specifically. When the word lime is used in a curse word type scenario, it can be interpreted in any negative way that one decides, as it is an unspecific curse word.