Every industry has its jargon, and almost its own language, in some cases. God knows web design has a lot of jargon, even if half of our made up phrases are fancy and nonsensical job titles. But for all of the silliness that comes with having to invent our own words and acronyms for things, jargon plays an important role: it allows us to communicate more efficiently with other designers and devs.
Sometimes, the person who (more or less) comes up with a concept gets to name it, as it was with Responsive Web Design. [Here I shake my fist at Ethan Marcotte out of long-standing habit. RWD is a good thing, but it gave me headaches for a while.] And sometimes someone comes along and makes up a word or phrase for something we’ve already been doing for a while, which is what (I’m reasonably sure) happened with Web 2.0.
Intrinsic Web Design (you can thank Jen Simmons for this bit of jargon) belongs to the latter category.