This is a short way to say 〜てしまった. It means an action is finished. Sometimes it shows you feel bad about what happened.
Verb [て-form] + ちゃったPrimary
Verb [て-form] + じゃった
This is a short way to say 〜てしまった. It means an action is finished. Sometimes it shows you feel bad about what happened.
ごめん、冷蔵庫にあったケーキ、全部食べちゃった。
Sorry, I ate all the cake that was in the fridge.
面白くて、一晩でその本を全部読んじゃった。
It was so interesting that I read the whole book in one night.
うっかり本当のことを言っちゃったから、彼女が怒っている。
Because I accidentally told the truth, she is angry.
すみません、注文を間違えちゃったんですが、変更できますか。
Excuse me, it seems I've made a mistake with my order; would it be possible to change it?
彼に謝ろうと思ったけど、結局、何も言えずに帰ってきちゃった。
I thought about apologizing to him, but in the end, I came back without being able to say anything.
This form shows an action is finished. It can mean you did something by accident. Or you did something you should not have. It can also mean you finished something completely. Think of it like saying "oops" or "all gone" after an action.
This is a casual way to say 〜てしまった. You use 〜てしまった in writing and talking. You can use it in many situations. But you only use 〜ちゃった when you are talking. It is very informal. It shows you are in a friendly chat.
Don't use this when you want to be formal. For example, don't say "宿題やっちゃった" to your teacher. The verb's て-form decides if you use ちゃった or じゃった. If the て-form ends in て or って, use ちゃった. For example, 見て becomes 見ちゃった. If the て-form ends in で or いで, use じゃった. For example, 飲んで becomes 飲んじゃった.
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