OTP in texting and online apps has two common meanings depending on the context. Most commonly, it stands for “One-Time Password,” which is a temporary code sent to your phone or email for secure logins or verification. It helps protect accounts by adding an extra layer of security. In fan communities or casual chats, OTP can also mean “One True Pairing,” referring to a favourite couple or duo people love, especially in movies, shows, or fandoms. For example, someone might say, They’re my OTP, meaning it’s their favorite pair.