Did a mini-dig in response to your post. Sorry to report that I found something on pandas and pedos. Sad.
https://www.urbandictionary.com/define.php?term=Panda%20Eyes&page=2
Panda Eyes
It is pedophile slang for child sodomy. When a child is forcly sodomized, it’s eyes can welt to black circles due to the blunt trauma involved, making their eyes look like that of a pandas. There’s apparel selling online that says “panda eyes” on it for the pedo community, as well as many pedophiles joking about this online with each other, talking about kids. There’s many innocent symbols and codes they use to reference their deviant perversions like pizza (little girl lover) and hotdogs (little boy lover) pandas are one of their symbols. Believe it or not. #cumpanda is often seen on pedo social media accounts when referencing pandas and children