The act of changing perfectly good words by a cell phone spell checker at the moment a text is send. Or changing a misspelled word to something that’s not even close and then sending the text without giving you any options.
John: “Dude, where did you learn to spell? Your text was all messed up.”
Dave: “I know, my cell spelljacked my text again.”
Having your words autocorrected by spellcheck, changing the entire meaning of your text.
Sorry baby, that's not what the text was supposed to say, I got spelljacked!