What kind of shit? Is it like explosive diarhea that splatters everything? Or is it like one big clumb that kerplops? Not a good analogy, although anal.
No, it is bad form. Would you flirt in a cemetary? McDonalds serves the flesh of dead animals and its clients are feasting on the flesh and enjoying the result of crule deaths. And you want to flirt? People that do that get heartburn. It is a punishment.