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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
Related Words
JSYK, this martini is delicious
JSYK by Cockroach3409 July 13, 2009
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
Jsyk, you dense piece of shit, you're gonna be in deep shit for stealing items from the managers office.
Jsyk by Zicronium May 3, 2017
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 Summer July 28, 2008