used by north western youths meaning something is shocking or nasty or behind someones back. Also it could be dishonest
1. You took that munch from his bag? That's pure sly. = You stole that luncheon meal from his hold all? That is not very nice.
2. You told her you had were going the dentists? That's well sly. = You told her you had a dentists appointment? That is very dishonest.
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