What does it mean to dream of chestnuts?

Your particular dream's meaning depends on what chestnuts mean to you. There may be other clues in the dream that provide more information than "chestnuts," such as where you are in the dream, what you are doing, and most importantly, what you are feeling.

There is a somewhat antiquated expression to refers to an old, over-worked and tired joke as "an old chestnut." In this sense, your dream might refer to something that is out-of-date, dull and needing to be replaced with something more effective.