sex on the sly

Cheating or trying to cheat when you have a spouse or significant other. Those looking for sex on the sly are liars and cheaters.

Nancy: Did you hear? Monty's lookin' for some sex on the sly. Jack saw him hit on a girl at the club.

Alice: You mean Monty, Sally's husband?!

Nancy: Yeah, can you believe it? He seemed so sweet and caring to her. Go figure.

Alice: Uh huh, another cheater.

by mad megawoman August 06, 2011

sly dog

a shifty-eyed individual would be best described as a "sly dog"

omfg George is such a fucking sly dog

by MoFo April 08, 2005

sly fox

A word used mostly in the ghettos of Harlem. Used to describe an attractive man.

"Nigga, that be a sly fox."
"Werd."

by Jordan. May 02, 2003

sly one

A slang term used among close friends, usually males. Suggest sexual activities will take place of which nobody will know about.

Adam: I'm gonna go for a sly one in a bit ;)
Jamie: Eh? Who? Tell me!
Adam: I can't. It's a sly one.

by Adamc0re May 10, 2007

sly pie

most commonly used as the colloquial name given to those approved of by myself and friends as an otherwise 'hotty'.

this phrase is a versatile wee thing used also to describe those who are evidently actual sly pies (rare), shifty looking characters and those who are somewhat of a 'pain in the arse'.

'oh my look at that sly pie'
and
'get away from me you sly pie'

by Gillian Anderson February 17, 2008

Sly Goose

An Act were two friends engage in sexual intercourse behind the back of others.

" Jimmy got gripped in the back of his motor with Steve's Bird getting blew off, apparently he'd been giving her the Sly Goose for a while "

by John Gaskell March 24, 2004

sly dog

Someone who goes out of their way to screw you over, often doing so in a generally gay/homosexual manner which induces anger.

-Defined elitely by DarkGrieverX

"Man what the FUCK? Peter the fag and the Sly One are so fucking gay, they slept together in the same bed and still don't admit they are homosexual, those SLY DOGS."

by Leo The ELITE April 07, 2005