“Very funny.”

Your boyfriend said that he wasn't going to get you a present for your birthday. He said it as a joke, but you don't think it's funny. You say:

Very funny.

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“God forbid we go a single day without it raining.”

Today you woke up to see that the sky is dark and it's raining again, as it has been all week. You're in a bad mood because you wanted to go out to play soccer with some friends today. You say to yourself, sarcastically:

God forbid we go a single day without it raining.

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“Thanks a lot!”

You're sick. Your friend called you, and she said that you sound horrible. You have a cold, so your voice does sound messed up. But you pretend to be offended by your friend criticizing your voice. You say:

Thanks a lot!

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“What? You mean you don't want to pull an all-nighter?”

You're working on a project at work with a group of people. You're not finished with it, but everyone is tired and it's getting late, so someone suggests picking it back up the next day. You think that's a good idea, but you want to joke that everyone should stay all night to work on it. You say:

What? You mean you don't want to pull an all-nighter?

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“Fine! I'll take it back!”

You bought your wife a new TV for her birthday. But she says she doesn't want it and she's angry that you bought such an expensive gift. After arguing about it for a few minutes, you decide that you'll try to return the TV to the store to get a refund.

Fine! I'll take it back!

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“Great! Now I have to re-do it.”

Memorize

While you're writing a document on your computer, the program crashes and you lose all the work you've done. You are upset. You say to yourself:

Great! Now I have to re-do it.

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“Yeah, good luck with that.”

Your friend isn't a very good singer, but he tells you that he's going to enter a singing talent show. He says that he's sure that he'll win first place. You don't think that's possible. You say under your breath (quietly, so he can't hear):

Yeah, good luck with that.

yeah

This is a more casual way of saying "yes". Use it in spoken conversation when you don't need to sound too serious.

good luck

"Good luck" is a phrase you say to someone to encourage them for something they're going to try to do. Before someone takes a test, applies for a job, or tries to write a novel, you can say:

Good luck!

If you want to specify what you're wishing them good luck with, you can say "good luck on (something)":

Good luck on your job search!

good luck with that

"Good luck with that" is a set phrase that people say when you're going to try something that they think will be hard or impossible.

The literal meaning of "good luck with that" is simply, "I hope that you succeed with that." However, this phrase has become popular to use sarcastically. So it often means "I don't think that you're going to succeed. Any kind of sarcasm should be used carefully, and only with people who you're close with.

This phrase is pronounced with stress on the word "luck":

Good luck with that.