blue juice
n.— «When I looked at it very closely, I could see that it was a newborn kitten, maybe just a few days old. At that time, I could hear the head Veterinary Technician (my boss) saying, “Just give it the blue juice (the liquid that is used for euthanasia) and throw it in the trash.”» —by Tanya Kay Tanya’s Story (Johnson City, Tennessee) May 8, 2006. (source: Double-Tongued Dictionary)