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Just to let you know.

Used to inform people of potentially useful information.
Joe: I was at the movies yesterday.
Jane: Oh, what did you go see?
Joe: Star Trek. It's completely worth the 10$ jtlyk.
by fellkin June 11, 2009
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acronym for "just to let you know" usually used in a not so serious conversation
J.T.L.Y.K , I can't go tomorrow.
by qwan allman July 29, 2008
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"just to let you know" as a precedent to an informative sentence whether scholarly or opinionated, light-hearted or deeply sorrowful this phrase has no boundaries
JTLYK my mom is super accomplished and likes to work out.
by TLCmeetstheBear February 16, 2017
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~Just to let you know.

synonomous wih "btw" this is for those who like to get fancy with their internet slang.
On Aim:

jack- ima go afk for a while
alex- k. i'll still be on jtlyk
jack- what?
alex- just to let you know
jack- let me know what?
alex- just go afk already goddamnit -.-
by A smart dumbass January 18, 2010
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