Pigwash refers to the food waste and leftover scraps that are given to pigs for their consumption. Synonyms for pigwash include swill, slop, garbage, refuse, and leftovers. Swill and slop are often used interchangeably with pigwash and refer to the kitchen waste that is gathered and given to pigs. Garbage and refuse also refer to the leftover food scraps that are typically discarded. Leftovers refer to the food that remains on a plate after a meal and can be given to pigs if suitable. All of these synonyms describe the common practice of feeding pigs with leftover food waste to ensure they receive a nutritious meal while reducing waste.