Often when I read posts in Seddit, there is some discussion about whether or not the suggested tip is creepy. Anything you say or do to or with a girl can be creepy. The reverse is almost true. Obviously there is some line where shit gets creepy under every circumstance, but for the purposes of this post, I will ignore those cases -- no one on Seddit is suggesting that you, say, eat your girlfriend's leg.
There are, in my opinion, two types of creepy. "Creepy" is often used interchangeably with "douchey." "How about you, me and your best friend get freaky" is creepy/douchey. The second type of creepy is used to mean weird. "I wanna keep you in the hole I've dug in my basement" is creepy/weird.
In my experience, there are two major tests that determine if you are being creepy. This is the meat of my post.
Attraction I feel this one should be obvious, but the evidence around here is that it's not. The more a girl is attracted to you, the more douchey/weird shit you can "get away with" and not "be creepy." Alpha males say douchey shit because they get positive feedback when they do. It's one of those cocky/confident things. The two words mean essentially the same thing; one has a negative connotation and the other has a positive one. It's really only douchey if the girl doesn't go for it. She'll go for more if she's attracted to you, so go hit the gym and work hard at your job and do things that make you more attractive.
Authenticity I actually had kind of a hard time picking the word for this heading. Basically what I'm saying here is that what you say or do is creepy based on how believable you are. It works both ways. Some things are creepy because your target doesn't believe you and other times it's because they do. If she believes you really have a hole dug in your basement, you're in for a bad time.
TLDR Get more attractive, and get more and less convincing. You're only creepy if the girl thinks so and you believe it.
there doesn't seem to be anything here