Short for Facebook-creeping. It is when you stalk someone on Facebook to, for example, find out if they're single or not.
Girl 1: Oh, my God! Did you see that new, super hot guy at school yesterday?!
Girl 2: Yeah!! I was freeping on him all night! Seems like he's single and that he loves Harry Potter!
Girl 1: Gaaah! He's so perfect!
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