Similar to photobombing, to ninjabomb a picture is to intentionally posing behind other people, peeking over their shoulders, under their arms, and in open spaces in other people's photos, for a later surprise.

The difference between a sneaky photobomb and a ninjabomb lies in that the ninjabomber is dressed like a ninja (in ninja garb).
Drew: "dude, I'm looking through my camera, I don't think I have ANY normal pictures of you from our halloween party last night."
Stephen: "yeah, but you do have over 20 of me ninjabombing."
by aronskelk12 November 3, 2010
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