I want to eat the chicken so I'm going to feed it for months until it's fat, then I'm going to ram a rotisserie stick through it while it's walking around the meadow and set it over a flame, which will cause it to perish some after roasting for some minutes.
That sounds a little bit insane. Why would you want to do this to a chicken?
I just want to have fun
It is wrong to fatten a bird to hurt and eat them later. You should just buy chickens from the store because they were killed in a nicer way.
Okay, so I can't have fun? Wow.
You can kill and eat the chicken, but do so in a humane way. There should be nothing fun about being cruel to an animal like that, and if you do find it fun then maybe you should go to therapy?