The action of forcefully taking an object, and using it for own purpose.
Or in other words-Kicking the crap outta some weakilng, taking his shit, and fucking inside-out.
And in other news, a band of wild-western bandits just hijacked a 20 century train, now how fucked up is TAHT!?
To hijack a browser.
2. To replace someone's home page to some crappy search engine that they would never have used and still won't even if they can't get it off their computer.