DWO is a slur used to describe Asians in a derogatory way. Driving While Oriental. Based on the idea that being Asian and driving is just as dangerous as being intoxicated and driving.
The word DWO is a racial slur that has been used historically to degrade and dehumanize asians. The word is still used by some people for this purpose, and it is seen as offensive and hurtful to asians. If you are unsure about whether or not it is appropriate to use the word DWO, it is best to err on the side of caution and avoid using it in any situation.