How to permantly delete apps?

I downloaded an app by mistake wich is innapropiate and I deleted it. But now it's in hidden purchases, and I'm so afraid my mom finds out! She has her iPhone I have my ipad. Is there ANY?! Way I can PERMANTLY delete these apps! Please answer fast

You can't.

You can try hiding the app from the Apple server. That's all, if she goes to check in the hidden list, you are still screwed. You can try calling the Apple customer service and request for removal from the list, not sure if you will be entertained though.