Someone who is mixed, black, white and Asian. Maybe they one parent is wasian and one is black, maybe one parent is Blasian and one is white, maybe one is Biracial and one is Asian.
A blawasian is a person of black, white, and Asian origin. It is a somewhat more judicious term than "caublasian" because it equalizes the use of the colors black and white to signify people of African and Caucasian descent who also trace part of their ancestry to Asia. But it is also probably more politically incorrect than "whiblasian" because "bla" at the beginning of the word may be construed as referring to the discredited eugenics notion that a person with "a drop of black blood" in her ancestry is de facto black.