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1.
Someone who looks over his/her shoulder while engaged in conversation with someone in order to find someone better to talk to.
That shoulder surfer i was just talking to wasn't even listening to me!
by _e_m_ April 14, 2006
 
2.
Someone who constantly looks and points to things on the internet while looking over your shoulder.
Eric: Go to that link!
John: No! I dont wanna look at "2 girls, 1 cup"! Stop bein such a shoulder surfer.
by Thomas Antonacci March 28, 2008
 
3.
Someone who steals PIN numbers at ATMs or public telephones by looking over people's shoulders while they enter their numbers.
He had a $2,000 phone bill after a shoulder surfer scoped the PIN for his calling card.
by P. Brain August 31, 2006