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.

the thing that you don’t have when you’re phones percentage is over 20

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.