Taste of Urine

At the usual dinner

Oppa : the soup is tasteless. Maybe they forget to add salt. Gotta ask them for salt.

Me : Or maybe they run out of salt

Wiko : They can add their sweat to your soup if they run out of salt. It is still salty right?

Oppa : Or they can use their urine because it is also salty.

Me and Wiko : *confused and shock*

Me : how do you know it is salty? already tried it yourself?

Wiko : Or addicted to golden shower?

And then Oppa is in silent, can't answer our questions. But really? the urine is salty??