1 definition by mrs. sucksby

Top Definition
while looking at one's computer, the surprise pop-up ad that appears independent of the user's actions. typically, this pop-up ad appears to block out the whole screen, and is difficult to close out.
"I was checking out that new website for shoes, and I got screenjacked with an ad for an online university."
by mrs. sucksby May 13, 2009

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