Definition from Wiktionary, the free dictionary
Proper noun 
Twinkie (plural Twinkies)
- (uncountable) A brand of cake, yellow in colour, and having a white, creamy filling, known for its artificiality and long shelf life.
- (countable) One of these cakes.
- (countable, US, derogatory, slang) An Asian person who dresses, acts and speaks according to Caucasian stereotypes rather than Asian ones (from the “yellow” outside and “white” inside; compare Oreo (“Black person who acts white”)).
Usage notes 
This term may have trademark status.
Coordinate terms 
Derived terms 
- In the film Harold and Kumar Go to White Castle, Harold says that his Korean friend would call him a twinkie – “Yellow on the outside, white on the inside”.