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A person or thing that photobombs or audioboms a video, recording or a picture.
"Maybe because of the backgrounders I cant hear your audio recording well?"
"Dang those backgrounders!!! they ruined my picture again!!!
A person who replies to a social media post/photo with a completely unrelated comment. Typically, the comment is in reference to something in the background of the photo.
Rather than be of help, Ted chose to be a backgrounder and commented on something unrelated to the post seeking advice.