Here's a breakdown of the possible meanings:
* "Sly" typically means cunning, deceitful, or secretive.
* "Kwim" could be a misspelling of "know" or "know what I mean." It's possible someone is using this as a shortened way of saying "you know what I mean?" or "you know?"
Possible interpretations:
* "You know what I mean, in a sly way." This could imply that the speaker is being intentionally secretive or trying to convey a hidden meaning.
* "Cunningly, you know?" This would emphasize the sly nature of the action or situation being discussed.
However, without more context, it's impossible to determine the exact meaning.
If you encountered this phrase in a specific context, please provide more details so I can help you understand it better.