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slang To surprise someone (intentionally or unintentionally) by unexpectedly appearing in a photo they have taken or are trying to take. Kevin, quit photobombing us! We just want to take one nice picture! Ugh, the guy in front of us must have moved because he ended up totally photobombing us.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.