That's (just) too much!
1. Inf. That is unpleasant and unacceptable!; That is more than I can bear! "That's just too much!" exclaimed Sue, and she walked out. Bill: I'm afraid this movie isn't what we thought it was going to be. Sue: Did you see that? That's too much! Let's go!
2. Inf. That is just too funny. (Compare this with You're too much.) After Fred finished the joke, and Bill had stopped howling with laughter, Bill said, "That's too much! Your jokes are so hilarious." When Tom stopped laughing, his sides ached and he had tears in his eyes. "Oh, that's too much!" he moaned.