As some already mentioned, urine is a really great fertilizer. Here in Sweden people use it all the time, dilute it with water (1 part urine, 2-10 parts water depending on if the soil is already wet and how much nutes your plant can handle) and water. It's called "golden water". I read on some swedish gardening forum that every time you pee, you throw away like 3-4 USD worth of top grade fertilizer.
And if you think it's gross: You don't water on the buds but on the soil. The plants don't absorb the urine, it simply uses all the valuable nutriets. Watering with "golden water" does not mean you will be smoing your own pee.