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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
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