Out of curiosity, what does a meth lab smell like? Lately around my neighborhood, I have noticed strong smells that have not been present before. A strong cat urine smell and at times a sewage-type smell. I mean, it smells so bad of cat urine, as if there was a thousand cats peeing in the same place, like gallons of cat pee. It's overwhleming. We smell it whenever we walk around the block. What would be some other signs of a lab? We haven't been able to pin down exactly where the smell is originating from.