Connotes a lack of interest in the current interlocutor and/or in what they are currently saying, and displays a desire to, if possible, upgrade to 'someone better' (e.g. of higher social status, better looks, etc.).
considered extremely rude and annoying by most of society
usually committed by parents or other nosy people
Person 1: -is texting friend about a party at his house friday night-
Person 2: -looks over shoulder of person 1- "Hey man, can i come to your party"
Person 1: "DUDE, QUIT SHOULDER SURFING ME"