‘Feed your demons’ is a reference to the Tibetan story of ‘Milarepa and the Demons’ in which he learned to dispel demons by providing for their needs, ultimately offering himself as food. https://alearningaday.blog/2020/01/23/milarepa-and-the-demons/
The Buddist practice of Chod is an extension of this concept, and Lama Tsultrim Allione has created a modern version of the practice she calls feeding your demons. As she says, ‘It turns out to be a remarkably effective path to inner integration.’ https://www.lionsroar.com/how-to-practice-feeding-your-demons/
"Your friends will know you better in the first minute you meet than your acquaintances will know you in a thousand years." - Richard Bach