Food blue balls
This occurs when you are promised food and you start to crave it a lot but then your mom/person does not get you the food and you have a feeling of past excitement
My sister said she was getting me a shake from Arby's but when she came home empty handed I got food blue balls
Junk food blue balls
Junk food blue balls is when you've been on a diet for far too long and you have been deprived of the junk food you so desire.
Shit man I've been on this diet for 3 days and I got mad junk food blue balls