Short for "Just so you know"
Jsyk, you dense piece of shit, you're gonna be in deep shit for stealing items from the managers office.
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Acronym for "Just so you fucking know."
This acronym is used instead of "fyi" or "btw." However it's more cold and ruthless than the generic "jsyk" aka "just so you know."
Example 1: Jsyfk, I need my money back, and you better get it into your thick skull that I mean business.
Example 2: I'm Julia's brother, jsyfk. If I find you near her once more, you're done for.