Dishwashers, washing machines, potted plants, and dirty laundry (about to be washed) are all good indoor options which require minimal cleanup.  An easy outdoor option (yes I did see the part about you not being into outdoor peeing) would be patio furniture.  Additionally, if you have a car with waterproof upholstery (e.g. Jeep Wrangler, Ford Bronco) you might try peeing in the car

I honestly don’t know how you guys are able to cut it off 😂 once I start there’s absolutely no way I can stop unless I didn’t actually have to go! I remember one time needing to do a urine test and they gave me this container to pee in. They had told me ahead of time to make sure the last time I peed was at least 4-6 hours ago and to come straight in in the morning before going pee. I was supposed to fill it to a spot between two lines. Because I hadn’t gone since 2am and woke up with a full bladder, I had to go so bad it was starting to hurt.  I had set myself up in the bathroom there by taking off my pants and underwear and was squatting over the toilet. I lined up the cup and tried to let out just a small spurt to fill the cup and then I could set the cup aside and release the rest of my morning piss. Instead, what happened was basically a small trickle for 1 second before my bladder took that as an okay to release entirely. I sprayed piss into the cup, splashed back on myself, overflowed the cup, pissed all over my hand, and with how forceful the stream was I actually overshot the toilet too and got a good amount on the floor while I tried to readjust.  I dumped out the excess in the cup, screwed the lid on, and tried to wipe down the outside of it with paper towels… left it in the deposit window still a little wet I think haha. 

I once peed onto a spider while in the shower. Was a fun way to wash it down the drain

Reminds me of a specific south park episode, where Britney Spears is caught pissing on a ladybug.. 🙂 I think the vote does not work really well, because after selecting "No" you still have to fill out the other three questions. I never intentionally peed on a bug. Insects are pretty robust, but I don't know if they'd survive my pee stream? 🤔 Anyway, Britney spears pissing on a ladybug:  

Thank you Sophie. I'm a very lucky man 3 sons and a beautiful daughter. 🥰