The acronym "OOTD" stands for "Outfit of the Day." It is commonly used on social media platforms to showcase a person's clothing choice for that specific day. People often share their OOTD to express their personal style, fashion sense, or to inspire others with their clothing combinations.
The term "OOTD" emerged from the increasing popularity of social media platforms, particularly Instagram and fashion blogs, in the early 2010s. It was created to provide a quick shorthand for sharing fashion choices without needing to type out the full phrase "outfit of the day."