Laugh Out Loud.. Laugh out loud, commonly abbreviated as LOL, is a popular expression used to indicate that something is funny. It is often used in text messages, social media posts, and online chats. Laughing out loud is a natural human response to humor .It has many health benefits, including reducing stress . Laughing with friends or family can also strengthen relationships and create positive memories. Whether it's a funny joke or a silly meme, laughing out loud is a simple pleasure that can brighten up anyone's day.