Quick question

[laptop]

What does LMK mean/stand for?
Had a pm and the guy says LMK me.
What does this mean?
Dont mean to sound like an idiot but I know not.

 

[weezer]

let me know

http://en.wikipedia.org/wiki/Internet_slang

which doesn't have LMK but is still helpful i suppose:

 

[laptop]

Thats what I thought but LMK me, "let me know me" didnt seem right.
My gramer sucks and my typing is worse so I shouldnt talk.

Thanks