1. The incedental act of following someone from activity to activity. Like seeing them in a mall and then at the movie theatre. (3rd degree copystalking is unusual, and in most cases constitutes stalking.)
2. The act of following someone from activity to activity for mere entertainment. Ordering the same drink as someone and then sitting nearby and talking about the same topic they are.
Becoming obsessed with looking a pictures of penises to the point that you can pick any random guy on the street and guess his cocksize to the centimeter.
"Iv got enough cockstalking under my belt to know hes got nothing under his!"