“This is like a dream come true for me.”

You just got accepted to one of the top graduate schools for your area of study. You're happily telling your good friend the news about it:

This is like a dream come true for me.

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“Sweet!”

You're a young person. Your friend got you both tickets to a concert that you wanted to go to. When she tells you, you say:

Sweet!

sweet

This is a very casual slang expression. It means something similar to "great" or "wonderful". It's used mostly by people in their mid-30's or younger, but it doesn't have any negative associations.

"Sweet!" can be used by itself like in the example above. Or it can be used in a sentence:

That is sweet!

By the way, this use of "sweet" is different from when you call a person "sweet". For example:

Thanks, that's really sweet of you.

You are so sweet.

When you call a person "sweet", it means that they're nice, kind, thoughtful, and so on. When you call a thing "sweet", it means you're excited about it.