BTW is an acronym that means "by the way." BTW is a very common acronym that is used in text messaging, emailing and chatting.
While there are other possible meanings for the acronym BTW, "by the way" is by far the most commonly used. Other meanings for this acronym, including "back to work" and "behind the wheel," are rarely used. BTW is most commonly used when one gives any form of additional information. In the English language, there are over 50,000 acronyms and abbreviations. BTW is one of the most commonly used.