- to ruin (a photograph) by appearing in the image without the photographer’s knowledge, often in some dramatic or comical way: My brother photobombed what would have been a nice photo of my grandma and me.
- to do this to (the subject of a photograph or the photographer): I thought I had a great picture, but I got photobombed by a pigeon flying by.
- a photograph that is ruined in this way.
