What Does Jello Mean by Frown Is a Four Letter Word?

i'm very grateful that i read the letter of recommendation that my professor, don rogan wrote for me for divinity school. I had no idea that you weren't supposed to do that. And i go back to that letter because it was so kind and generous, and it sort of showed the best version of me. So anya, as you read the letter  just know thati you shouldn't be doing that. Ha, ha, ha,Ha! That's a good question. Can you laig this mystery? To rest roses are red. What does jello mean by frown is a four letter word? Done.