你們做夢。

In your dreams!

You're dreaming.

In your dreams.

You guys are dreaming.

Source: Tatoeba

Sentence Composition

1 你們 nǐmen you (plural)
2 做夢 zuòmèng
  1. to dream
  2. to have a dream
  3. fig. illusion
  4. fantasy
  5. pipe dream