An acronym for Damned Skinny Asian. It's used mainly to refer to girls and young women, although some men are technically DSAs. The term originated due to the propensity of people of Asian descent to be slimmer (and thus, more healthy-looking) than the average American. Originally used derisively, the term has taken on a second meaning -- namely, Asians in general.
Wow, take a look at that DSA in the yellow skirt. Her body mass index must be in the 5th percentile!