By the way: used esp in emails, text messages, etc.... Click for English pronunciations, examples sentences, video. BTW is a written abbreviation for by the way, used to add extra comments or questions in emails or texts. Learn how to use it, see examples and translations in different languages. What does BTW mean and stand for? In this lesson, you will learn the definition, other meanings and conversation examples of the acronym “BTW” in English. BTW Meaning What Does … BTW stands for By The Way, a casual phrase to add extra information or change the topic in a conversation. Learn how to pronounce, use, and avoid common mistakes with this abbreviation in texting, emails, and social media.