What's the plural form of luncheon meat? Here's the word you're looking for.
Answer
The noun luncheon meat can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be luncheon meat.
However, in more specific contexts, the plural form can also be luncheon meats e.g. in reference to various types of luncheon meats
or a collection of luncheon meats.