Don't be found with 〜てはだめだ
Grammar Explanation: Must not do with 〜てはだめだ

While telling ghost stories at night, Rize relays the tale from her childhood, of a frightened servant walking home one night. Rize says she herself was the culprit, practicing sneaking around and crawling through the bushes.
- 「バラしちゃだめじゃん!!」
- “Don't be found!!”
Key Points
1ちゃ contracts ては
- バラしてはだめ becomes バラしちゃだめ in casual speech.
2じゃん adds an exasperated reminder
- じゃん contracts じゃない and has the force of “you know you shouldn’t!” rather than adding a second prohibition.
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