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JSYK stands for Just So You Know.
My friend says it all the time because she thinks she's chill when she says it because noone else knows what it stands for. Then we have to just say it all out. It's more fun to just leave the person hanging by not telling them what it means.
Guy: Woo, Look at that girl in those shorts! Mmm.
Girl: JSYK, She's a huge slut. She's got babies daddies all around here right now.
by Bones77 June 14, 2007
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Acronym for Just So You Know... Intended to replace FYI. Letters can be said individually, or J-Syk (rhymes with basic).

Invented in Boise, Idaho, 2007.
Just a quick J.S.Y.K., traffic on I-84 is backed up clear to Caldwell.
by thegenoshow March 03, 2011
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Girl: Hey, wanna come over later?
Guy: sure, but JSYK I gotta leave by 5
by AceHoops July 24, 2018
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20
JSYK or jsyk is an acronym for "Just So You Know", used when messaging.
Hey mom, JSYK I ate all our bread
via giphy
by MarkAndrewThompson July 09, 2019
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