Green Maeng Da (Hyper Hippo) Review Why Is Hyper Hippo the #1 Happy Hippo Kratom Leaf of All-Time?  Since our birth in February 2013, Hyper Hippo has been one of Happy Hippo's most popular strain! Hyper Hippo has sold nearly double the a mount of any other Happy Hippo Leaf.  Why? While "Maeng Da" strains are historically thought to be the 'highest-quality' and "Green" is the most common color, there is actually more specific custom...