Don't tell me you forgot again!

don't verb

— do not (negative auxiliary) — (nonstandard) does not — do not

don't interjection

— interjection

don't noun

— Something that must not be done (usually in the phrase dos and don'ts).

tell Verb

— When you tell something to someone, you speak to the person about some fact or idea. He always tells the truth. I told all of my friends about Wiktionary. I will not tell anyone — If you tell, you let a parent, teacher, police officer, etc. know that somebody did something bad. I'm sorry I hit you. I'll give you a dollar if you don't tell. If you're lying, your eyes will tell on you.

me Pronoun

— You use me instead of your name, to refer to yourself. This is my book. It belongs to me.

you Pronoun

— Used instead of the name of the person being spoken to; it is a second-person pronoun. You are my best friend. Can I go to the shops with you? — Used to talk about anyone. You have to be 18 years old to see that film. She has problems with her eyes, and can't see you properly.

you Determinative

— Used before a word that means the person or people someone is talking to. You guys can leave now.

forget Verb

— When you forget something, you have no memory of it. I forget every thing that you tell me. When you asked me, I forgot. You told me your name, but I have forgotten it.

again Adverb

— Once more. They didn't understand the answer, so they asked again.