Has anyone felt urine after masturbating

I experienced the same thing and I cannot say what is was, maybe urine

It's urine.
https://ucimenshealth.com/erectile-dysfunction/climacturia
https://www.healthline.com/health/ejaculating-urine-after-prostatectomy#support-a-partner

I had NS RARP just over 7 months ago. Although I was continent immediately after the catheter came out, I had several minor releases of urine during the first 3 months as my body figured out the new normal. This included during intercourse a few months after the operation. At this point (7+ months) the urine release no longer occurs. However, after climax I do produce a tiny amount of a sticky fluid that I believe is from the Cowper's glands and urethral glands that is produced during arousal and orgasm. My understanding is that this fluid serves a lubricating function and is a normal part of sexual arousal and orgasm, even after RARP. But it's a very small amount. BTW, I'm not a medical professional nor an expert in this stuff, but rather just sharing my experience after RP. Best wishes.

I've read up on this a bit and from my research it's not uncommon for urine during orgasm for a little while as you and your body adjust to the missing pieces. The Cowpers gland produces the clear sticky fluid (aka pre-cum) and is still around, and that fluid is meant to clear the way for sperm to safely travel by neutralizing the acids from your urine.

I planned on this being an issue for a while and assumed I would just use condoms for a while until the urine part of the equation settles down, as the fluid from the Cowpers gland will work just like it always has and is not a problem. There are some guys that have never had that "pre-cum" and perhaps it's more sensitive now that the prostate is gone, I'm not sure.

This is very common. It almost requires a condom if having intercourse.

Definitely happened to me and it’s urine.

The first time I killed a high flying fly with a blast of pee. Takes some time to get used to the "new me". My doctor suggested and I found it helpful for pelvic floor engagement.

Climacturia is a common thing after radical prostatectomy. For the first 3-4 months, I would even get it on occasion when I hugged my wife. It settled down after 9-12 months, and no longer is an issue for me.

I am over two years out from radical prostatectomy and I have still have climacturia and erectile dysfunction. Emptying the bladder helps some. It is less than originally