Top definition
To do something cunningly, preferably without any one seeing, apart from your best mate to prove you did it
"Hey Jo, see that girl there? Well we danced and she is now carrying my child!!!"
" Slllly!"
by Jizz muffin May 20, 2003
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Aug 3 Word of the Day
Condition which causes you to place an Amazon order, then shortly after remember something else you needed and place another order.
Wow, 10 Amazon boxes showed up on my door today. My Amazheimer's must be acting up again.

Person 1: Bro, your Amazheimer's is getting out of control.
Person 2: It's OK, I have Prime.
by SamboMayhem August 01, 2020
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2
secretive, being very smooth or mischevious
Wow Kelly you are one sly dog

Did you see her jump that kid, she was so sly

by Estafuton February 28, 2009
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3
so like when I'm imagining "sly" I just see a real slick looking dude just posted up against a suspicious building under a shadow.. zoom in and the fucker has a tooth pick in his mouth just so effortlessly sweet
that nigga think he so sly but he's white so...
by young wells master September 12, 2013
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4
A slang term for a man who is more sexually attracted to other men than to women. It is not usually derogatory but it can be sometimes. It has the connotation of a gentleman who is educated and refined and who does not "broadcast" their orientation.
"I don't think Chris wants to have sex with you Lauren - he's sly."
"I was totally plastered and I wanted to have sex with this really really hot guy, but it turned out he's sly, so he just walked me back to my dorm instead."
"I can never make friends with guys unless they're sly. Otherwise they are always staring at my breasts."
by Mark Williamson November 06, 2006
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5
Sly-
A word to describe a harsh or demeaning action
''Hey''

''Hi''

''I had sex with your moms nans mom last night, and her cums like talcum powder''

''SLY!''
by SurefirePig November 03, 2012
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6
A guy I think that is cool and especially funny. He tries to put his grades up and tries to listen to the teacher when explaining a lesson. He sometimes draws but I don't think they're that good. Sometimes he's drawings are random, like sometimes he draws something cool and awesome and sometimes he just draws nonsense.
Sly tries to be cool around his friends and makes you laugh all the time.Sly cares what grade he gets and tries to recite in class. He tries to be quiet in his seat and tries to be obidient.
by Uncknown323>8 July 13, 2011
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