Final answer:
Without context, it is not possible to accurately answer what the worst part of a smiley to eat is in Trevor's opinion.
Step-by-step explanation:
The question seems to be related to a specific text or context involving a character named Trevor and his opinions on eating parts of a smiley. For a direct answer, this would require knowledge of the specific text or story being referenced. Without additional context, such as a book or a character study that specifies Trevor's opinions, it is impossible to provide an accurate answer to what the worst part of a smiley to eat is, according to Trevor.