the enthusiasm for the large quantity and variety of foods that you have in front of you at the buffet; getting pumped about the large meal you are about to consume.
A high level of buffet spirit would lead to buffet momentum.
"Its time for to go eat at the buffet, you better have your buffet spirit!"
"don't worry, Ive got my BUFFET SPIRIT!!! This buffet won't know what hit it"