sly grin

Showing in an insinuating smile that shows to have some secret knowledge that may be harmful or embarrassing to the person the grin is aimed at.

He turned to her showing a sly grin

by JustMae November 2, 2013

Sly Moundjered

A big unexpected right or left landed as a result of an arguement and/or clash of personalities.

"I thought we was okay, i was on the phone and all of a sudden he "Sly Moundjered" me

by Kieran1991 February 22, 2009

Sly Five

A sly five is essentially a high five, but can only be used appropriatly when somebody has accomplished something very sly.

Two kids at school steal a friends pencil case with out him noticing.

Kid 1#:wow, your really sly at stealing things
Kid 2#:this calls for a sly five

Two assassins kill their target from one thousand feet away using a silenced sniper rifle. Nobody notices.
Assassin 1#: omfg that was awesome
Assassin 2#: sly five me

by jedimasterjames January 15, 2010

SLY_D3ATH

a person that plays CoD, on ps3, with his fellow clan (541), he has a tendancy to Cause mental breakdowns to neepers. he plays quite often with Jester357 and Crazy_fock. overall, Hes as sly as your death

FUCK MY LIFE I WANA RAPE MYSELF SLY_D3ATH KILLED MY ASSAULT DRONE

by Neeper151's assault Drone November 27, 2011

sly diggin'

purposely talking about someone who's friends with you on facebook or follows you on twitter/instagram/tumblr.

friend one: yo, did you see that she was sly diggin' her ex on twitter
friend two: yeah, i really don't why she's still doing that. it's been a year after their break up

by Amelia Bottomly January 8, 2013

sly steez

A newer genre of music, similar to rap, but a lullaby in essence, designed to put anyone and everyone who comes into contact with it to sleep.

"Did you hear the new sly steez?"
"Hell no, and you need to stop listening to that shit before you land yourself into a coma."

by you tried January 19, 2014

Sly Cow

It is a British term. It can be used as a player but is Normally used as a name for a man trying or making the first move such as, holding hands, a hug, or, a kiss

Wow he tried to hold your hand that means hes a sly cow.

by Jenna Axe November 2, 2016