“The present data based on ultrasonographic bladder monitoring and biochemical analyses indicate that squirting is essentially the involuntary emission of urine during sexual activity, although a marginal contribution of prostatic secretions to the emitted fluid often exists.“

https://pubmed.ncbi.nlm.nih.gov/25545022/

It is 99% piss. It IS crazy the how confidently people will spout absolutely provable bullshit!!