A person- who you added on Facebook even though you don't know them very well or might not even know them at all- who comments on your pictures, statuses, or posts.
Liz: Some random girl commented on my profile picture and said "I don't even know you... but you're really pretty!"
Joe: Whoah.... she's definitely a super creep...
Furry round the edges, shiny in the middle: a generally bizare and creepy individual.
Note the furry exterior and shiny interior. After thorough examination we can conclude this specimen is indeed a 'super creep'.