noun
the act of spying on the information entered on a computer or other electronic device by looking over the shoulder of the person using it
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Shoulder surfing is a serious security risk in public places where sensitive information may be viewed by unauthorized individuals.
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I caught someone shoulder surfing while I was typing my password at the coffee shop.
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Dude, stop shoulder surfing me while I'm texting, it's annoying.
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In a crowded room, it feels like everyone is shoulder surfing your thoughts.