I heard if you pee on the affected area it will stop the pain​ instantly!

It actually makes sense :). Not sure if instantly, (never tried myself) but the nettles venom is acidic and urine is alkaline, so it should have some effect in neutralizing the sting. What I can tell you for sure, the fertilizer smell just like manure and if gets on your skin, it stays there for a while 😅.