Making Gibberish

A while back I posted about an artist named Ryan Leslie. I was, and am still, immensely impressed by his talent. I mentioned his song Gibberish as one that is so creative and original that I recommended everyone listen to it. The first time I heard it, i thought, "How in the heck did this guy come up with this?" My good buddy, B found this video that explains it all. I found it to be pretty slick; but that's just my opinion though, and who the hell am I?