It’s amazes that in this day and age, lots of people still don’t recognize common e-mail shorthand. If you’re constantly confused by some of the alphabet soup floating around in e-mails, text messages, and instant messages, here’s a quick guide to turn you from clueless to cool. IMHO, these are the most common abbreviations, IMHO. TTYL – Talk to You Later. OMG, WTF is up with that? OMG! OMG!”]
Source: https://www.csoonline.com/article/2127096/ten-e-mail-abbreviations-you-need-to-learn.html