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1. OOTD
"Outfit Of the Day"

Usually used on fashion blogs, or other places where people show others that they are wearing or have worn.
"Here is my OOTD."

Same as "Here is my outfit of the day."
2. OOTD
Outfit of the day, usually found on Tumblr or fashion blogs
'Here's my OOTD. I'm wearing red flats & skinny jeans.'
3. OOTD
Opinion Of The Day
Jersey Shore shouldn't be as popular as it is. Just my OOTD.

OOTD? You look awful.
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