When your email/MySpace/other electroniccommunication account has been hijacked by a virus that then uses your account to send messages to all your contacts, usually to continue spreading the virus, and/or distrubute spam.
Hey man, I didn't think this bulletin from you on MySpace looked legit, I think you got spamjacked.
A Shut Up cartoon series that airs on Tuesdays and talks about Layta who needs Derf's help because her family has been, as the title says, snowjacked, or as I like to say, being kidnapped during the blizzard.
No one knows how her family were captured or who captured them but it's a funny story in some cases. However, if one's friend/family/boy or girl friend was snowjacked and they asked for help from someone, most will either freak out or regurgitate.
A form of belittling one persons opinion or argument by portraying them as the soyjack meme. Usually by alternating characters in capitalization “WhIcH LoOkS sOmEtHiNg LiKe ThIs”. or in the case of a real life conversation, saying the persons point in a high pitched annoying voice.