A fat or obese guy. He is fat because he eats a lot; a lunchbox is full of food. Can it be more obvious?
"Hey, Lunchbox, quit taking my food!"
Someone who lies, cheats, murders, rapes, steals, and or commits any sort of crime while claiming to be a religious follower/believer of Jesus.
Todd: I go to church every Sunday. I am such a good person, and I am faithful to Lord Christ and his teachings.
Frank: Didn't you rape that 12-year-old girl, and cheat on your wife while you robbed the prostitute?
Todd: Yeah, but I don't get your point.
Frank: You must be Catholic.
Todd: Precisely, but I still don't get you.