Definition of shoulder surfing noun from the Oxford Advanced Learner's Dictionary

 

shoulder surfing

 noun
noun
BrE
 
; NAmE
 
[uncountable](informal)
 
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the practice of watching a person who is getting money from a machine, filling out a form, etc., in order to find out their personal information The PIN numbers were obtained by shoulder surfing. Learn how to spot shoulder surfing.
See the Oxford Advanced American Dictionary entry: shoulder surfing