On social media apps such as TikTok and Twitter, people use the letters L and W to abbreviate the words "Lose" and "Win" respectively. The definitions for these two letters are pretty fluid, and they can be used in various contexts. For instance, when someone writes just "W" in response to a video, it usually stands for "win" or "winning." In other words, people may use it to mean something like "winning at life" if they want to congratulate the person in the video for something they have achieved. On the other hand, when someone says they "took an L" or refers to a situation as an "L," it means that they did not succeed or achieve their desired outcome. The letters L and W are also used to describe a situation in which someone or something has experienced a defeat, failure, or setback.