1. A person (usually a male) who stalks females. The guy usually watches and stares at them and Many times listens in to conversations or the victim.
2. A person who checks out your profile all the time to seek/gather information about a certain person. (Spying)
3. An older guy hitting on younger girls.
"Oh my, that guy is staring at you and following you again!"
"Eww, i know, He's such a creeper!!"