"Kitchen scraps" refer to the leftover or unused portions of food or materials that are no longer needed in the kitchen. These scraps are typically discarded or thrown away. Full definition
We've tried some coconut in there and we always have a pile of kitchen scraps for them. (mybigfatgrainfreelife.com)
They won't be able to find the bugs and plants they do in the warmer months, so you can supplement their feed with kitchen scraps for extra nutrients. (bodyearth.net)
I make it with kitchen scraps for a broth that costs nothing, but tastes fabulous and is full of vitamins and minerals. (theherbalspoon.com)