Twitter trending acronyms are a mystery to those who are 140 characters behind.

Every so often, certain phrases will trend that are only made up of letters - such as the BRB, G2G, TTYL of the good old AOL AIM slang.

Nowadays, acronyms become popular so quickly that people do not understand what they refer to. Preceded by a hastag, these abbreviations may be quite puzzling when they appear for the first time on your trending list.

Fret not, Twitterly-challenged. Here is a list of some of the some of the most obscure Twitter acronyms decoded for your tweeting pleasure.

  • CIR = Comprehensive Immigration Reform
  • CX = Correction
  • DWN = Detention Watch Network
  • FF = Follow Friday
  • FTW = For The Win
  • HT = Hat Tip
  • IKR = I Know Right
  • IRL= In Real Life
  • JB = Justin Beiber
  • MT = Modified Tweet
  • NTTW = New To The World
  • OH = Overheard
  • OOMF = One Of My Followers/Friends
  • PRT = Please Re Tweet or Partial Re Tweet
  • RTHX = Thanks for the ReTweet
  • SMH = Shaking My Head
  • SMM = Social Media Marketing
  • TL;DR = Too Long; Didn't Read
  • TMB = Tweet Me Back
  • YKYAT = You Know You're Addicted To
  • YMMV = Your Mileage May Vary
  • YOYO = You're On Your Own
  • ZTWITT = (to tweet extremely fast)