Top Definition
To sneak a peak at an opponent's screen, when competing in a multi-player, online environment, e.g. Call of Duty, in order to find out where they are so you can go shoot them. Screenhackers are the subject of much finger-pointing and deriding upon discovery.
John: "You're looking at my screen you cheating son of a wh*re"

Fred: "No I didn't, I was just checking my watch"

John: "I so caught you screenhacking!"
by Pukezilla January 07, 2011
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