BRB is an acronym in colloquial online communication, meaning “ be right back .” It is commonly used in messaging and chatting when someone needs to temporarily leave their device for a short time. Discover what " BRB " means in texting, social media, and online conversations. Learn how to use this common abbreviation effectively today! What Does Brb Mean ? The abbreviation BRB stands for “Be Right Back.” It is commonly used in online messaging and texting to indicate that the person needs to temporarily leave the conversation but will return shortly. It is often used when someone needs to take a short break, such as going to the bathroom, answering the door, or running a quick errand. The term BRB gained popularity in the early 2000s with the emergence of mobile phones and online messaging platforms. It is widely used ... Check online for what is BRB , meanings of BRB , and other abbreviation, acronym, and synonyms.