We hashed all this out in another thread, tho I don't think there was any "final answer" agreement, just as now. The real reason is that it continues to evolve. I have used it as "very", "extremely", "a lot", "a lot of", "many", "tons" etc. And when one student might correct my uso blanco, another will approve, so there's not even consensus amongst the originating users. I've noticed that most teenagers, regardless of all the PC categories, use, or at least understand, "mad skills/z", and even adults throw it in now and then... :0)