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1.
(adj) to be diverted from an important task by some asshole who keeps wasting your valuable time with other bullshit. A combination of being sidetracked and hijacked.
Sorry I couldn't be at your death bed sooner, Ma. I got sidejacked by this guy at the mall selling gym memberships. He was real convincing. Ma? Ma?
by The Northern Skeptic October 08, 2009
 
2.
When someone is taking a photo of themselves, and you get in the picture right next to them at the last second.
I was taking a photo of myself to send to my boyfriend and Amy totally sidejacked me.
by madmikeone July 02, 2008