What is the meaning of SMH in chat rooms?

What does SMH mean? Here are the top forty texting and internet chat room abbreviations you really must know. Don't look like a nOOb or be AYSOS'd. No one wants to be ROFLCOPTER'd, either!

It's easy to get in over your head in chat rooms or when messaging on your cell phone, so take a look at this list of chat room abbreviations. These internet chat room abbreviations will help you avoid an embarrassing duel in a public chat room. They'll also give you the confidence you need for the next time you find yourself in a conversation with a "QTPI."

Oh, by the way, SMH means Scratching My Head.
  • YL: Young Lady
  • WU: What's Up?
  • WTG: Way To Go
  • WB: Welcome Back
  • TPTB: The Powers That Be
  • TBD OOTD: To Be Done One Of These Days!
  • TY: Thank You
  • SOL: Smiling Out Loud (or You're Out of Luck)
  • SHID: Slaps Head In Disquest
  • ROFLAPMP: Rolling On Floor And Peeing My Pants
  • ROFLCOPTER: Rolling on Floor Laughing and Spinning Around in Circles
  • PMFJI: Pardon Me For Jumping In
  • PU: That Stinks!
  • POV: Point Of View
  • nOOb: Newbie
  • MYOB: Mind Your Own Business
  • L8R: Later
  • LTNS: Long Time No See
  • LHU: Lord Help Us
  • LUVYA: Love Ya
  • JMO: Just My Opinion
  • IDGI: I Don't Get It
  • IYKWIM: If You Know What I Mean
  • IMPE: In My Previous/Personal Experience
  • HAGU: Have A Good 'Un
  • HHOK: Ha Ha Only Kidding
  • GF: or G/F Girl Friend
  • GTSY: Glad To See You
  • GR8: Great
  • FIL: Father In Law
  • EOD: End Of Discussion
  • DW: Wife or Dear wife
  • C4N: Ciao For Now
  • CYA L8R: See You Later (See ya lata)
  • CID Crying In Disgrace
  • BBN: Bye Bye Now
  • ADN: Any Day Now
  • AYSOS: Are You Stupid or Something?
  • ATK: At the Keyboard
  • 88: Love and Kisses