I live in a rural area and will sometimes just step behind the house to urinate. I got to noticing that in that general area the grass was dying.
After a few months it came back and was the best looking grass in the yard. I guess it kills it first then fertilizes it.
The tinkle of life
The dose of nitrogen is strong especially in morning urine and can kill weeds or grass, but it can fertilize also.
You can over-fertilize you know it burns the plants.