used to show you are annoyed when someone has done something you are unhappy about or has failed to help you in some way

"I told Dad you'd love to wash his car." "Thanks a lot." “我告诉爸爸你愿意帮他洗车。”“多谢你干的好事。”

Thanks a lot for supporting me. (= You did not support me.) 多谢你的“鼎力”相助。