(well,) imagine that! spoken
Used to express a surprise or astonishment, particularly in response to the information which has been recently revealed.
He has been awarded the Nobel Prize for literature. Well, imagine that!
Her grandfather made a recovery after undergoing a tricky operation. Imagine that!
To be surprised by some sudden occurrence
To greatly surprise, shock, or confuse someone
Extremely stupid
Did you follow his guide and take your mom's money? You are thick as mince.