What does OOTD mean?
OOTD is an extremely popular hashtag used on Instagtam. Users use #OOTD, which stands for Outfit of the Day, when they upload photos of themselves in an outfit. Users often upload Outfit of the Day photos when they get a new outfit or feel like their outfit looks nice. The acronym OOTD is also used on social media sites like Facebook, Twitter, and Tumblr, where users share photos of outfits. It is very popular on Tumblr, for example.
#OOTD = Outfit of the Day