Hey, Guardian, welcome back!
A little googling reveals that "Khas" appears to be the Urdu word for "vetiver."
It's "Khas khas" in Gujarati and "Khus khus" in Hindi.
Vetiver's a grass note which is found in lots and lots of western fragrances -- including Guerlain's Vetiver, one of the most discussed frags on these boards. Some other personal faves of mine are Vettiveru by comme des garcons, Vetiver extraordinaire by Frederick Malle / editions de parfum, and Vetyver oriental by Serge Lutens.