Buffet momentum is the lack of self-restraint one experiences after having started eating at a buffet. This phenomenon causes a person to consume above and beyond what comprises a regularly sized meal. This feeling usually occurs in the first fifteen minutes of the buffet and is further perpetuated by:
a) remembering something delicious that you saw earlier and didn't have room on your plate for
b) wanting more of something you just tried
c) the desire to make the price you paid worthwhile
d) the need to illustrate to your friends that your stomach is indeed a bottomless pit.
"Wow, I just consumed three plates of food. Maybe we should wait a while before hitting up the dessert table."
"I disagree. In about 10 minutes my stomach is going to realize that it's full, so I think I'll just make use of the buffet momentum that I've developed and get dessert right now."