Twinkie is a slang term for someone who looks interesting or attractive physically, but inside has little value.
(noun)An example of a twinkie is someone who seems very beautiful and kind, but is actually mean and uninteresting.
The definition of a Twinkie is a brand name for a processed sponge cake with a cream filling inside.
(noun)An example of a Twinkie is a small yellow cake that comes in a plastic wrapper that may be found in a child's lunchbox.
See twinkie in Webster's New World College Dictionary
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noun
Origin: < Twinkies, trademark for small, yellowish pieces of spongecake with a creamy filling