sly off

If you have been called a "sly off" then you have snook off with a friend right after being with another friend.
This was used in Middlesbrough alot back in the day, meaning anyone around the age 17+ were either sneaky shitty friends or had shitty little sly off friends.

karren - " I was with sammy the other day right and she only fucked off with beth from Pallypark."
Fay - "Really?! what a fuckin sly off"

by fresh prince of bellend April 14, 2009

sly one off

Having a cheeky wank without anyone knowing.

Be right back I'm off to sly one off before my wife gets back

by Just the tips November 4, 2018