What Does “Btw” Mean? Btw is a common, informal abbreviation used in digital texts, chats, and social media conversations to introduce a new thought or piece of information. BTW, which stands for “By The Way,” is a popular abbreviation in textspeak. It is used online, in SMS text and even in speech. Discover the different meanings and uses of BTW. BTW (also written btw) is an initialism, so each letter is pronounced individually if you say it out loud. btw written abbreviation for by the way: used, for example in emails, when you are writing something that relates to the subject you are discussing, but is not the main point of the discussion: What does the abbreviation BTW stand for? Meaning: by the way. What BTW means in text, slang, social media, and conversation. Complete guide with examples, usage tips, and tone explained in simple terms. What does BTW stand for? BTW abbreviation. Define BTW at AcronymFinder.com. BTW is a common abbreviation used in texting and online conversations. It usually means “by the way.” People use it when they want to add another thought, mention something they almost forgot, change the subject slightly, or introduce an extra detail.