What Is EVOO? EVOO stands for Extra Virgin Olive Oil. It is an oil used for shine and to seal in moisture. It may also be used as a pre- shampoo treatment. POSTS RELATED TO THIS TERM Is The Extra Virgin Olive Oil You Are Using In Your Hair Authentic Or … 4 Super Cheap Grocery Store Oils That Work Great For Your Hair … Why Olive Oil Is Perfect For Hair Growth TweetPinShare0 Shares Home » Glossary » E » What Is EVOO?