1. Somebody who can put you in a tricky situation without you noticing.

2. Somebody who can make your plans backfire.

3. An incredibly stealthy person.
1. Carl: Hey Megan! Do you like John?
Megan: No way! Gross!

Carl: Hey John, I think Megan likes you, she totally admitted!
John: You think so? I might ask her out...

John: Hey Megan, want to go for a coffe later?
Megan: Please don't make me puke!
John: Sly fox...

2. Greg: Hey Matthew, want to get back at Louis for wrecking the party?
Matthew: Sure!
-Plans go ahead but Louis makes thier plan backfire-

Greg & Matthew: SLY FOX!

3. Zac: Wow, Katie sure is a sly fox!
by IFeelThePAIN May 19, 2007
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A strange person from jolly England that likes to chase drunken men around pubs, with promises of illicit favors.
Often seen wearing womans clothing, and in the company of a wombat and a dead nordic pony.
Geeze go tackle Jerry before he embarrases himself again. Hes drunk and pulling a Sly Fly again. And for all thats pure and good in this world, Grab that wig off his head.
by Phydeaux2 March 20, 2004
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A person who is slick and makes hard things look easier than what they are. A sly dog is also someone who is good with sweet talking the opposite sex.
Tony is a sly dog. Did you see how he got Ashely's number then when and kissed Jada.
by Hustle young June 16, 2016
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A word to describe how devious someone is towards others!!!
JODIE is a SLY CUNT for acting like a good friend then stabbing you in the back and getting you fired.
by Jabba the fat fuck March 28, 2016
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When your wife convinces you she isnt cheating but you find out she's been cheating with EVERYONE.
Ugh I found out everyone at the Christmas party slept with Amy even though she said they didn't. I got the sly Amy.
by Thelargestlarge January 23, 2016
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A certain person He/She that goes under the radar when it comes to the opposite sex, they are sneeky and hard to catch
by Puss92 September 10, 2010
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