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The act of sneaking an extended middle finger (the bird) into a photo.
After being rejected to be a bride's maid at her best friend's wedding, Allie got her revenge by bird bombing the group wedding photo.
Bird Bomb by Johnny Tsunami 5150 January 18, 2022

bird bombing 

A nicer way of describing sightings of the middle finger.
Barbie Dahl: "Ken, why were your friends bird bombing in our wedding pictures."
bird bombing by intrepid402 October 14, 2017