In the restaurant business, it is important not to alert the customers when you're talking about them, so code is often used to refer to individuals without having to point or stare. One of the most popular and useful is "butter", which signifies a pretty girl in the restaurant. This could be considered slightly sexist, but the female employees seem to enjoy it.
Used in a sentence, it would appear like this:
"Take this spoon back to the butter on 18, after I lift their plates."
If table 18 is occupied by a beautiful girl with green eyes and a strapless gown, and an older, prunish woman, you know your target.