photobombing 

Intentionally posing in other people's photos, for a later surprise.
Usually people making funny faces in the background, without the knowledge of the main subjects of the photo.

Jim is always photobombing, he messed ups some of the best photos from the wedding.

photobombing by U8IK May 6, 2008

Photobombing 

The act where one or several persons ruin (sometimes improve) a photo by performing funny acts in the background which may include a dry gangbang, holding stick like objects up to your crotch or raising your clothing.

Hey Johnno's been photobombing all the photos from the party. See his ass in the shop window in the background?

Photobombing by ladiesman219 June 23, 2009

selfie photobombing

A picture taken of a random background, often a blank wall, wherein the photographer ruins the photo by inserting their own face. Selfie bombing photos are usually uploaded to facebook, Myspace or any other sort of social networking website.

Also, see selfie and photobombing

Carla is constantly selfie photobombing the photos of her bedroom wall.

selfie photobombing by Chaser33 April 11, 2014

PhotoZombing 

A subset of Photobombing where someone deliberately appears in the background of other people's photos while adopting a zombie-like pose.

Man did you see James picture on the beach, there's some guy photozombing in the background like totally night of the living dead.

PhotoZombing by Groaning Required September 21, 2011

Photo bombing

The fine art of ruining other people's photos. Usually by running in the background or making a silly face in the background. It's usually done to strangers, but shit man, you better run if they notice at the moment, because you might get your ass kicked.

Hey Geo, check out them tourist. Let's do some photo bombing on them.

Photo bombing by SiLentThReaD August 17, 2008

photo bombing

The fine art of ruining other peoples photos

dood ive been photo bombing ms nadler all nite

photo bombing by swastikool March 28, 2009

Photo Bombing

Benedict Cumberbatch at the oscars.

Sally: "Have you seen that photobomb at the oscars?"

John: "Photo bombing? Oh, you mean that Benedict Cumberbatch?"

Photo Bombing by Ghetlg March 19, 2014