Someone who exhibits shady, underhanded behaviour or acts in a deceptive manner
That Anne is a right sly egg
by ScouseRJ November 20, 2014
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A person who is just beggining to be sneaky,devious,lucky,slippery, etc. and will eventually be a "sly dog".
Gabe: That new kid is trying to steal Austin's wallet.
Channy: He is such a sly puppy.
by ▒☺♫ May 7, 2009
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The Best Funk Artist Ever! He also smoked week a lot. Amazingly he's still alive
He's so cool he's like Sly Stone
by Valhalla April 7, 2004
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1) A wily Bulgarian folk hero, known for outsmarting his Ottoman rival Nasreddin Hoca, and the corrupt Bulgarian upper class. First appeared in 16th-17th century sources

2) A sex act illegal in many countries, which, when done successfully, is performed without any knowledge of the other person involved. Popularized in Bulgaria
1) Sly Peter is like the Robin Hood of Bulgaria

2) I'm totally going to sly peter that chick tonight. She's not even gonna know.
by spanky1279 April 5, 2011
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A tactical snooze siesta in the afternoon.
It's gonna be a late one tonight, I'm off for a sly Phil!
by Pierre Van Hairgone August 23, 2012
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A guy that is very very sly. So sly to the point where your jaw drops when he does his cunning actions.
Freddy: "Cory, I can't believe you just benched 365; That's so incredible!"

Cory: "Yeah, I'm what you call a Sly Guy."
by Backflip Guy August 2, 2009
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When you put your middle finger up to somebody behind an opaque object (predominantly a door), releasing anger but not getting into trouble. Usually used by young teens, aimed at parents.
"My mom was being so annoying... so i sly signed her through the door when i left the room."

"No way dude!"
by Landoddage May 28, 2009
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