What is Pre-Poo? Pre-Poo means Pre-Shampoo Treatment. This is a treatment that is applied to the hair before shampooing. POSTS RELATED TO THIS TERM 5 Unique Pre-Poo Recipes To Spice Up Your Hair Regimen Should You Pre Poo Using A Conditioner Or Oil? How To Pre-Poo Your Hair With The Raw All Natural Aloe Vera Plant TweetPinShare0 Shares Home » Glossary » P » What is Pre-Poo?