When a person has latched onto you and tracks your every move, to the point that you can't leave your house without being paranoid about the person mysteriously popping up and interrogating you.
Origin: The episode of Jersey Shore when Pauly D's girl kept following him around as he hung out with friends on the boardwalk, and then called the house 3 times in a row to find out where he was.
Girl: "Why didn't you call me last night? Where were you? Who were you with? I called you 3 times and you never called me back and I KNOW you got my messages!"
Boy: "OK, seriously, you are stalking my life on the boardwalk right now."
Boy: "Hey, so you're single now? You dated for what, 7 months? And your ex transferred schools?"
Girl: "How did you know all that?"
Boy: "I checked your Facebook."
Girl: "Could you stop stalking my life on the boardwalk?"