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i have no idea what this is about but i bet it's either about pee or cum.
You're right; it's about pee.
Apparently cicadas send a stream of pee instead of droplets like most insects. Scientists studied them since a stream of pee should use more energy at their size and they are studying why/how they still use that method.
https://phys.org/news/2024-03-cicadas-unique-urination-fluid-dynamics.html
I mean, I first thought blood, but I think you're right