Ew gross! No, don't go eating a big spoonful of butter. What a waste of pointless empty calories!
If you're feeling okay about having a snack, sure, have something else. A healthy choice, not a spoonful of butter! :)
But if you don't feel like eating then don't. It takes months of habitually under-eating to affect your metabolism, not just one day.
Just plan to make sure this doesn't become a habit. :)