Dirty Chai = (Soy) Chai + a shot of espresso.
I only heard of it recently from Sean Bonner, but they knew it by name at my local Starbucks. Turns out it's been around since at least July 2006.
It's not just the caffiene -- the espresso really lends to/intensifies the earthy flavors of the chai. It's a perfect winter drink.
Dan Telfer
Wow, I am going to buy this right now.
Dan Telfer
Update: fucking yum.
The barista told me that if you get a larger one (Venti at Starbucks) it's common to get a second shot and that is called a "Down and Dirty Chai".