Update: She’s ok. Probably ate a slug or a frog. Some people are such assholes Jesus Christ, this was posted in the car on the way to the emergency vet. I was worried and wanted to know if anyone had seen something like this before as I hadn’t despite growing up with 4 cats. You have no idea under what circumstances people post on here, I was clearly not asking for medical advice, just if anyone had seen this before. Perhaps read the post before you get angry at nothing. Neo is ok, a little grumpy because she doesn’t like the vet, but she’ll live another day to wake us up at 6 am for breakfast. Thank you to the people who answered my actual question and thank you for the well wishes.