On Twitter, for example, a direct message is a message between only you and the person who sent it. It is not the same as @reply which everyone can see! Twitter keeps changing their features, but usually to "DM someone," all you need to type is D username message.
Online jargon, also known as text message shorthand, used in texting, online chat, instant messaging, email, blogs, and newsgroup postings, these types of abbreviations are also referred to as chat acronyms.For the largest list of Internet acronyms and text message jargon, click on "more info" below!
NetLingo Classification: Acronyms and Text Message