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1.
An Americanized Asian; asian american.
Johnny Thai, Jet Li, or other asians who have accepted american culture and have "americanized"

Johnny Thai is an Americasian.
by JQT August 31, 2005
 
2.
An attractive woman of Asian decent who is typically tan and possibly has fake boobs. She also has an American accent and is well domesticated.
Todd has a fetish for Asian women, but only Americasians because they're really hot and they speak English.
by Gangsta Bib March 08, 2011