A person who weirdly watches and observes other people he shouldn't have that much interest in. This could be by way of peering through windows, around corners, or through binoculars.
Also can be applied as a derogatory term to anyone who appears weird or strange.
Guy 1: Dude, Sam's Dad was totally being a creeper again at practice today!
Guy 2: I know, I saw him sitting there in a lawn chair and staring at us with binoculars!
by ZXBobSaget September 21, 2010
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One who creeps.
Lizzie: Hey! I saw you last night..
Melanie: Umm... creeper?
Katie: ONE WHO CREEPS!!!!!
by Kaystie January 14, 2009
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A mass(prescott) moving slowly towards its target or on largely populated sites looking up girls while rubbing their nipples.
Man that creeper is on facebook again, hope he doesn't rub his nipples off this time.
by Blackstar89 November 7, 2011
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Someone, usually male, who acts in a socially unacceptable manner, normally pertaining to females.

Usually these are men who stalk younger women, go to parties they are too old for, or date/have sexual relations with their therapists/garbage women/mutual friends.
David: I am dating my therapist!
Marti: You're such a creeper.
by M.Rogers October 6, 2009
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someone who sneaks around little children, a pedophile
Mr. Erchlich is creepin hard body around the class that damn creeper
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In traffic, when a lane is blocked up ahead, a creeper goes to the very front of the blocked lane and then cuts in to the moving lane, thus slowing the moving lane down even more.
On the highway, when there are roadworks ahead, the creepers delay the through traffic lanes by creeping up the blocked lanes.
by hereward pooley January 7, 2007
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This person takes creeping to the next level. To outsiders, it seems as if their main goal in life is to freak as many people out as possible. These people text, email, stalk, mail, and EVEN fax their victims. These people are usually young males in their 20s and 30s who frequently attend college bars between 1 and 2am looking for drunken 18 year old women dancing provocatively with their friends. Sadly, they are rejected, ignored, and even kicked out of venues due to their creepiness and usually ugliness.
Allan texted Katie a picture of a guy's ding dong while stalking her last night. He is SUCH a creeper!
by Climb the Highest February 13, 2011
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