Basically shortened for 'on the sly' basically a way of describing somebody doing what ever slyly or by doing something quite cool.
Popular around the north west of England

*Guy kicks a football*

'ahh look at him kicking that ball ont sly'

*guy sneaks into room'

'Look its joe ont sly'
by KyleMc March 26, 2008
5 Words related to ont sly

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