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I'll let you know

The phrase that someone uses when they're never going to tell you shit.
Friend 1: Hey, are you free this week?

Friend 2: I'll let you know.

*Never talk to each other again.*
I'll let you know by Brownie72 December 26, 2011

Okay, goodbye, Edan. I just wanted to let you know that I enjoyed the good times we've had. However, I truly hate you--like, I absolutely hate your fucking guts 

One of the greatest insults of all time. Originally said by Johnathan Andrew Wicker, Junior on June, 18, 2019
Johnathan said this to Edan, "Okay, goodbye, Edan. I just wanted to let you know that I enjoyed the good times we've had. However, I truly hate you--like, I absolutely hate your fucking guts," Edan killed himself shortly after

if anything changes I'll let you know 

something you say after a lame excuse to cancel plans with friends, usually for a better offer, without any real intention of considering original plan
a guy you've been dying to go out with asks you to dinner Friday night:

Sorry Rachel - I won't be able to make it to your sister's middle school graduation Friday night - will need to work late that day but if anything changes I'll let you know.

I will let you know 

Something people say when they actually infact never let you know.

Whether its an event, something for sale, or any overall expectation. “I will let you know.” Its almost like a curse, its a clear “No”, with a skin of false hope.
James: “I will let you know when its available, Mark.”

*10 years later*

Mark: “What ever happened to it, James?”

James: “Bro, I told you I will let you know. Be patient.”
I will let you know by Connor4333 December 13, 2022

Shower, eat and let you know 

This is the phrase used by a Cheeser, a Cheese-out or Roid McCheeseout when he is attempting to prolong the time before his cheese is properly identified.
Daren asks "Jarryd, do you want to go out tonight?"
To which Jarryd responds "Lemme shower, eat and let you know".
Jarryd will not be going out tonight. He is cheese-ing.

thank you let me know 

thank you let me know the darts buses has left the fleet number
thank you let me know by Leokalan December 23, 2022