+0

Does "thanks a bunch" in American English mean exactly the same as "thanks a lot" or maybe it expresses some kind of discontentment?

+1

It's often used sarcastically, when thanks are not actually being expressed.

I see you've eaten the last of the cheesecake I was saving for my lunch. Well, thanks a bunch for that!'

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Rover_KE

It's often used sarcastically, when thanks are not actually being expressed.

But not always?

No, not always. Rover said 'often'.