Today's new phrase is "wishful thinking"
This means a hope or a dream that is probably not going to happen.
A. One day, I'm going to win the lottery!
B. Yah, right! Wishful thinking!
A. Some day, I'm going to visit the moon.
B. That's just wishful thinking. Unless you have a million dollars.
I know it's wishful thinking, but I would definitely like to buy a new house.