What does sneak peek mean? I couldn't find it in any dictionary.
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peek from hiding
secret peek
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Look quickly at something that you are not supposed to look at.

eg I took a sneak peek at the exam paper of the person sitting beside me.

Best wishes, Clive
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a sneak peek is just a small clip of a movie that is released before the movie as a sort of "teaser" for audiences.
Hello Clive! I have seen this 'sneak peek' everywhere. But I did not understand. Now, after your explanation, I understood!

Thanks a lot.

here is another definition: A "sneak peek" is defined as a special viewing or informational presentation of an art piece or product, given to a select audience before being shown to the general public. It is synonymous with "special preview" or "teaser."
source:"http://wiki.answers.com/Q/Meaning_of_sneak_peak "
Oh thank you very much for your useful example of usage. I'm a non native English speaker and that helps me a lot. Thanks so much again