in one's dreams prepositional phrase1 •(informal) Used to express the speaker's belief that a preceding statement expressed a desired rather than an actual state of affairs."Can't go? Why not? Got a hot date tonight?" / "In my dreams! No, I've got to visit a friend in the hospital.""They said the economy will boost sales next quarter." / "In their dreams! Maybe next year the economy will recover."
in your dreams phrase1 •(informal) Used to express the speaker's skepticism about another's preceding statement about a desired or assumed state of affairs.
