Japanese 292 - Denying permission with verb + ちゃダメ

We can make ちゃいけない even more informal by using the word ダメ instead of いけない.

When using ちゃダメ or じゃダメ, it's acceptable to either include or exclude the at the end of the sentence. Including the tends to be a bit more assertive or emphatic, while excluding it makes the sentence a bit softer or more informal.