To update a person's status on a social networking site without their knowledge. Usually done while the person has left their phone or computer unattended.
Combines the words status & hijack.
The word was invented by my friend Meredith after her son Carson had updated her facebook status, yet again, to make fun of his sister Cassidy while Meredith was out of the room.
Meredith returned from the kitchen to find Carson had statjacked her facebook profile, again. It now read "Carson is the BEST!!!! He's my favorite child."