when you either a. talk about food and tease your appetite and it causes severe hunger OR b. when you have a small snack or appetizer that causes the black hole that is your stomach to open into an abyss. Always leads to a big food gorge, and then later a food coma.
"wow I just ate a handful of Cheetos and blue balled my stomach, now I am starving "
*looks at food porn "fuck now I have a blue balled stomach"