Facegasm
When you eat something so good your face turns into a happy pig and your whole body starts vibrating like it just got a high five from God.
I ate a burger so good my face had a facegasm and I started vibrating like a radio.
That pizza was so good my face had a facegasm and my eyes rolled back.
I took one bite of that cake and my face had a facegasm so strong I screamed.