I have to admit that I really liked this. The only problem was how the animation wasn't that good. I still think it's great to see such a happy song using genitals. It's not even used in a sexual manner, but a bathroom manner (is there a difference?). Anyway, I just didn't know what the piss was going to do next! I thought the grandmother was going to die at first, but then she just turned into a baby!
I just find the image of a grandmother turning into a baby funny. It seems like you were heavily inspired by Weebl's stuff. He's so popular it's easy to see how you would think like that. He wouldn't make something as risque as this, though. I appreciate the colors too.