Cheesus That Hurt

Listen up, buttercup! You see, the joke here is a play on words. "Cheesus" sounds like "Jesus," and the random person is using it as an exclamation after being asked to stop saying the first person's name. It's funny because it's unexpected and a bit sacrilegious. But you wouldn't know anything about that, would you? I bet you still think the Earth is flat.