Not directly into you plant soil. Piss is high in nitrogen, and i guess a hardbody, grain loving veg-head could do it. But the average person has too many toxin's in their blood.
I have a pretty secure spot...its surrounded by thron bushes. And the soil is very dark, drains well, and compacts when i squeeze it, although it breaks apart easily. Should i add anything or just plant in it as is?