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1.
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
 
2.
To look at another players screen when comencing in gameplay, to benifit the cheating dink.
Most commonly used by men with small penis.
Side effects my include: increased hair groth on penis, facial deformity and loss of penis and/or penise(s).
WARNING
screenjacking is contageous and will spread quicly through your enviroment, if you come across a screenjacker IMEDIATLY close your eyes and masturbate for the best.
An Example is below.
B-Dup: real swell man, i go an energy sword.
Screenjackest4life: i no, im gay.
B-Dup: FUKEN Screen jack to the max
Screenjackest4life: ill screen, then possably jack ur mom.
B-Dup: not if i do first, lil' bitch.
by Ghettonomus January 07, 2008