A person who does weird things, like stares at you while you sleep, follows you through the club, constant DM's, IM's and likes pictures from 3 years ago, or looks at you for hours through a window. Usually a close friend or relative. you know right away if that person is a Creepy Dude or does Creepy things. it is not hard to spot the Creepy Dude.

Also see Creeper, and Charlie Wilson a/k/a Creepy Uncle Charlie
While I was taking a selfie "Creepy Dude" in the background counting my neck hairs.
by mynduse September 2, 2014
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"Some Creepy Dude is so awesome and he totally didn't type this like 3 minutes ago"
by Some Crippling Dude July 6, 2017
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Young person's term for anyone over 40 attempting to have sex, especially if the young person is jealous of their apparent success.
"Check out that creepy old dude at the bar with the hot Latina chick! WTF? He must be loaded!"
by HCUser October 28, 2006
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Legend.

Look Some Creepy Old Dude up on Facebook.
It's an awesome page... and sexy.

Look it up all all will make sense.
Loser: you like Waycest yah?
Some Creepy Old Dude: of course, I'm its pimp.
by thfhidsji 7 January 9, 2012
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