Top Definition
Shorter, easier way of saying
'on the sly' meaning 'in secret' or 'not obviously'.

Usually pronounced like 'ont sly' by people from the north of england.
Chloe: aww look at you, you're well excited on sly!
Amy: I so am not!!
by cocacolaprincess21 August 07, 2007
5 Words related to On Sly

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