Dreaming of urinating signifies wasting money unnecessarily or illegally. It may also indicate a marriage with someone who is not suitable for you or with whom you are incompatible. If you find yourself urinating repeatedly in your dream, it could signal important changes or gains in your life. Such dreams serve as a warning for you to reflect on your decisions.
From Imam Muhammad Ibn Seerin's Dictionary of Dreams According to Islamic Inner Traditions â entry "Urinating" (page 456).
Urinating in a dream means wasting money in an unnecessary or an unlawful way. It also means a marriage to an unsuitable or a non-compatible person. Frequency of urination in a dream means receiving regular income. On the other hand, suppression of urine in a dream means the opposite, or it may mean hastiness, or making an incorrect decision. If one sees himself urinating in an unknown place, in someone else's house, a lodge, a town, etcetera in a dream, it may mean kinship with its people. Wetting one's underpants in a dream means a newborn in the family. Urinating in the sea in a dream mean paying taxes or giving charity. Urinating in a valley in a dream means expansion of one's progeny. Emitting bad odor after urination while others are looking with despise in a dream means defamation, or exposing one's ills in public. Drinking urine in a dream means earning unlawful income. If one sees his servant or employee urinating inside a well or a stream in a dream, it means that someone from his family will betray its interests. Urinating in a dream also means dispelling distress.
Note: Islamic dream interpretation depends on the dreamer's circumstances and state. This is a general guide drawn directly from the source book.