1. Dropping all or some of a significant meal on the ground or another dirty surface that makes it inedible.
2. A senseless and ridiculous waste of food.
1. Eating an ice cream cone outside on a 100 degree Fahrenheit day is a sure way to drop dinner. Some of it will end up on the sidewalk every time. Use a cup.
2. Making agricultural systems and food distribution as efficient as possible is a good idea. Letting food sit in a warehouse, go unused, and rot is Dropping Dinner.