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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.
jsyfk by Zicronium May 14, 2017
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"Just so you know." Excellent for text messaging, MySpace and most importantly, daily dialogue.
Kate: Jsyk, you've gotten fatter over these holidays.
Steph: I eat my feelings okay.
jsyk by jsyk, it's Ursula January 14, 2008
Related Words
The "new" FYI. FYI is old school. JSYK (Just So You Know) is a more casual, friendly means of giving your friends and colleagues semi-useful information.
JSYK, it wasn't Roy, it was Isaac.

or

JSYK, I checked on that thing about Phil Collins and the drowning, and it's totally an Urban Legend.
JSYK by IsaacN January 6, 2006
is an acronym for the phrase "Just so you know"
JSYK, this martini is delicious
JSYK by Cockroach3409 July 13, 2009
Guy: Hey dude jsyk, i banged your girl last night.
jsyk by filiru2pny June 25, 2008
Internet lazy phrase: "Just so you know..." Simply invented to save keystrokes.
jsyk, i rarely stay up past midnight.
jsyk by Brian February 19, 2005
M: Jsyak, I just shit myself.

F: Ew, jsyak, I'm grossed out...
jsyak by lolzeee August 27, 2008