What does anti-photobomb mean?

anti-photobomb meaning in Urban Dictionary

a person who should come in a photo whoever face is mysteriously missing, often when you are misplaced behind someone else's head.The opposite of a photobomb. Whereas a photobomb requires bursting into an image, an anti-photobomb is more of an implosion, except because of the effectation of no-one noticing.The introvert's photobomb.