Not actually creeping up (ie) behind someone, but could also be depending on the given situation.
To know enough about a person that you don't actually know (ie where this person works). Creeping would consist of using that small bit of knowledge you have about said person and going on the popular website called facebook and attempting to look them up.
Amy: You know that guy we saw today at lavish&squalor?
Katie: Yeah he was super-cute!
Amy: You know right? I just totally went on facebook and looked up the Lovin' Lavish&Squalor group, found a picture of the guy (which was tagged) and creeped his profile. He's super sexy!
The state of suspicion or uncertainty in a woman's mind regarding a mans inappropriate and obscene sexual intentions or to his current legal status as a sex offender.
When StevetoldMary he really liked her lips she was really, really creeped out.
To look up someone's facebook profile, generally without adding them, with the intentions of seeing their relationship status, mutual friends, or pictures they're tagged in.
12 step recovery jargon referring to someone new who talks about how great life is, now that they're sober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.