Used commonly in Upstate New York and Great Lakes states 1 To check out what's going on by driving or walking around, usually when you go out with friends with no specific plans or destination in mind. To scan Facebook constantly, looking at everyone's profiles, interests, photos, etc. Shaggy's girlfriend caught him red-handed creepin' with the girl next door. The act is usually committed by a person who is know to frequently do this, a creeper. Following what is going on in someone's life by watching their status messages on Instant Messengers such as MSN, and their updates to their social networking profiles on websites like Facebook or MySpace. Yo I think my girl is doing something with someone else Word, shes creeping. The act of hitting on chicks when you are black-out drunk in hopes of hooking up with them. Creeping is commonly done by jealous or skeptical girlfriends, to make sure their boyfriend is not talking to other girls, or commenting on their pictures. Recon may involved simply driving by, or by one member of your party scouting a location in advance.