1. (noun) - A computer program that allows you to edit and manipulate different qualities of a picture.
2. (verb) - To digitally manipulate a picture in order to make it look different from the original one.
Photoshop is useful in many ways. It is often quite difficult to tell the difference between an authentic picture and a photo-shopped picture (one that has been digitally manipulated).
She will photoshop your yearbook picture to get rid of all that hideous acne.
I will use Photoshop to make my enemy look fat.
The photo-shopped picture makes the woman look pregnant.
That picture looks like it's been photo-shopped.