,A person who takes a picture of a person taking a selfie. They can be anywhere when someone is taking a selfie. The person taking the selfie has no idea that they are being photographed by the ninja. This is not a photobomb---the ninja is not in the selfie, so position is key.
"Hey man, check out the hot piece of ace! Whoa, she's taking alot of selfies! I'll stand right here so she won't see me and take some pictures ! "

"Stand over there so she won't see you. You can be a selfie ninja! "
by Buck Walter July 26, 2016
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Taking a selfie on someone's phone without them knowing.
Shari did a ninja selfie. She is soooo hot, what a sexy surprise!!!
by Inspired_by_Shari_@Kai August 29, 2014
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Taking a “secret” selfie with someone else’s phone, while waiting to take a photo for them, for them to find later. This is done as a fun prank.
I asked the couple if they would like me to snap a pic of them and I took a few Ninja selfies while they got ready.
by Fitchic July 1, 2019
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