1. To really enjoy the entire experience of a delicious meal or
food. 2. When a
food or a meal is so yummy that it makes one feel very very happy. 3. When on really enjoys the flavor of a
food or meal. 4. To be overtaken by flavor.
I
just had the most marvelous burrito for
lunch! It was a total yumfuck!" or "Wasn't that
casserole a real yumfuck?!" or "Thanks for these delectable brownies. They are yumfucking me!