It's a very slang/colloquial way of saying 'It made me feel really uncomfortable' Something that's yucky or disgusting can make you feel 'creeped out'! Bye for now Malini

Creepy = "Of or producing a sensation of uneasiness or fear, as of things crawling on one's skin." So, "It creeped me out" just means: "Made me give a creepy feeling." Like 'weird' -> "It weirded me out."

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Hello Bulent, It could mean both to make you feel either afraid or uncomfortable or worried. Examples: "It creeps him out to watch horror films." ( feeling afraid) " It creeps her out when he gets drunk." ( feeling uneasy or worried)