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1. photoshopping
The act of using an image software application, especially Adobe Photoshop, to manipulate an image, usually for comedic reasons

See also:
photoshop, shop
Websites such as Something Awful and Fark are well-known for photoshopping contests
2. photoshopping
Shopping for photos at the photo store / photo hut / photo shop.
Guy 1: "I'm going to go photoshopping, be back in a bit."

Guy 2: "But your computer's here."

Guy 1: "Not that kind of photoshopping! ;)"

(they break out into laughter)

Guy 3: "Will you guys keep it the fuck down over there?!"
3. Photoshopping
The act of taking a photo of someone, editing it humerously without the person knowing and distributing to friends via myspace or other such websites.
"you got totally photshopped!"

"I'm photoshopping Carl's face onto a fat naked man, lolz!"
4. photoshopping
Going shopping and taking photos of yourself in the mirror. Usually done in pairs, common in blog girls and those who use Twitter.
"We went to the mall but didn't find anything, we were photoshopping, we're so blogging these"