For the last few months, my son has been playing with language. It's fascinating to watch, because this didn't start until after he had a pretty good grasp on functional English. What he does is makes up new words (that sound very similar, and he goes through phases on the words... first words that sound like "lee-low" now words that sound like "bingo"). After he's used his imaginary words he tells me, "That means..." and goes on to give them a new definition each time (even with the same exact words). The most common definition of just about everything is, "I love you", which is sweet.
Initially when he started playing with these made up words, he called the Spanish. I just happen to speak some Spanish (though I don't use it much, I was pretty much fluent back in the early 90s). So, I've told him that Spanish is a different language and if he wants to he can learn it, but that the words he was using were a different language, and he really ought to call it something else.
I enjoy watching this process and will try to occassionally update as he continues to grow in this and other areas.