that is the last of someone or something; there is no need to consider someone or something anymore. It just started raining. So much for our picnic this afternoon.So much for John. He just called in sick and can't come to work today.
that is the end of something He told me how his parents divorced, then said, “So much for the storybook romance.”A bird hit my windshield, and I thought, so much for that bird.
Usage notes: usually said about a disappointing end