The Mixing of Urine
Interpreters have said that if one dreams of urinating alongside another person and their urine mixes, it may indicate establishing a connection and marriage ties between them.
Per Ibn Sirin's Muntakhab al-Kalam fi Tafsir al-Ahlam
Note: These are traditional scholarly interpretations (ijtihad) drawn from a specific classical source — not a binding religious ruling, fortune-telling, or a prediction of the future.