acronim for Just So You Know. can be used in a smug, sinsere, sarcastic, or normal sense.
( katie ¢¾¢¾ ) says: oh jsyk i quit Facebook.
- Zac - says: oh man i just added u as my friend. :(
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.