I'm going to leave a restaurant without paying for my meal
Why will you dine and dash?
I don't want to pay the bill because the food wasn't good for me.
Not all restaurant food will be good, but it's not fair to not pay just because you didn't like it. You got a service and you should compensate them, you are being a thief and a potential criminal for not doing this. You need to just man up and pay, and get on with your life.
I don't care what you say. I shouldn't have to pay for gross food!
It is hard to believe you didn't like the food if you finished everything on your plate. You know next time you can tell the waiter you don't like it after a few bites and they may forgive the price on their own.