Simple enough, we all have seen asians act.. well. Black.
Exactly. Nigasians are asians who act black and act "gangsta". They think they are the "shit" but they ain't shit.
Very recognizable when they wear HUGE shirts and PANTS hanging off their butts, or females have huge HOOP earrings and talk like "Yo yO yo! Biatch" kinda thing.
Nigasian: "yO bIaTChEz. i'M sO cOoL yO. i'D kill yOu"
"vtec vtec vtec!!!"