Exageration by employing the imagination. Often done to improve the appeal of a story and increase dramatic content. Also includes adding adjectives to the story. Imagerating may go beyond the bounds of normal exageration. That is things can be imagerated to include things outside bounds of physical reality.
Telling something as one imagines often by recreating a memory rather then how it really was.
First heard by a 9 year old little boy, "I wasn't exagerating I was imagerating."