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

Photobomb 

The one innocent thing you should NEVER say at an airport.

Guy: "Photobomb!"
*CLICK*
(Get booted off the flight)

Photobomb by Sherlock21st May 9, 2011

photobombardier 

One who bombs photos with the dedication, if not the pinpoint accuracy, of a crew member on a bomber aircraft.

Neddy von Noodle was a practised photobombardier, showing all the other dachshunds how it was really done!

photobombardier by aviatrixen January 5, 2015

anti-photobomb 

Someone who should appear in a picture whose face is mysteriously absent, often by being misplaced behind another person's head.

The opposite of a photobomb. Whereas a photobomb involves exploding into a photo, an anti-photobomb is more of an implosion, except with the effect of no one noticing.

The introvert's photobomb.

Friend: Hey, here's a picture of all of us. But where's Tim? Maybe that's him--the one who turned last minute?

You: Yeah, that's him. He's shy, you know, so he anti-photobombed.

anti-photobomb by hoochiscraaazy September 26, 2010

reverse photobomb 

When you see something so weird or amusing you have to bomb your own photo to get the goods. The opposite of a photobomb, where someone jumps in at the last second to be in it.

snapping that photo of the elephants boning behind you. No one wants to admit they were looking, but now you have photographic proof! reverse photobomb!

reverse photobomb by tfghost November 5, 2009

Photobomb 

to jump in a picture right before it is taken in Ontario, Canada it is known as the pop-in

im gonna photobomb all your nice pictures

i gotta go try and rock some pop-ins

Photobomb by CHUBBYdaking March 29, 2010