thanks a bunch

Interjection

idiomatic US

(idiomatic) A mildly sarcastic thank you. / (US, idiomatic) An unsarcastic thank you.

Japanese Meaning

軽い皮肉を込めた「ありがとう」 / 真摯な感謝を込めた「ありがとう」

Oh, thanks a bunch for eating the last piece of cake!

ああ、最後のケーキを食べてくれて、ありがとね。

Sense（1）

(idiomatic) A mildly sarcastic thank you.

I really wanted a bucket of water dropped on my head. Thanks a bunch.

Sense（2）

(US, idiomatic) An unsarcastic thank you.

Thanks a bunch for that great Christmas card you got me!