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A slang retort indicating one's skepticism. Oh, dream on—you'll never become a famous singer. A: "I really think I'm going to get the promotion." B: "Dream on! I have a much better chance of getting it than you."
What you are expecting or wanting to happen is nothing but fantasy. You want to get promoted to general manager? Dream on. You, an opera singer? Dream on.
dream ˈon(spoken, informal) used to tell somebody that an idea is not practical or likely to happen: ‘Do you think if I ask my boss for a pay rise, I’ll get one?’ ‘Dream on!’
To fantasize about something that is improbable or unrealistic. Used chiefly as a scornful command: So you want to move to Hollywood and become a movie star? Dream on!