don't let the door hit you on the way out

Phrase

idiomatic sarcastic

(idiomatic, sarcastic) Used to indicate that one is glad, or at least unmoved, to see the addressed person leaving.

Japanese Meaning

相手の退場に対して皮肉や嫌味をこめた別れの挨拶として使われる表現 / 去っていく相手に対して不快感や無関心を表し、あえて軽いジョークや皮肉を込めて「さよなら」と告げる意味

If you're really leaving, don't let the door hit you on the way out — we've had enough.

本当に出て行くのなら、出て行ってくれて結構だよ。もうたくさんだ。

Sense（1）

(idiomatic, sarcastic) Used to indicate that one is glad, or at least unmoved, to see the addressed person leaving.