twinkie
Twinkie (noun) means a yellow sponge cake with a white cream filling, noted for seeming artificial and reputedly lasting a long time before going stale.
Etymology
The brand name is said to be a diminutive, twinkle + -ie (or otherwise modified), based on a billboard for "Twinkle Toe Shoes" in St. Louis, although there are also claims for solely one or the other. The meaning in reference to well-assimilated Asians is derived from the slur that they are "yellow on the outside, white on the inside".