A big baby hippo

A phrase to describe someone who is cognitively degenerating. Synonym of "going off the deep end". Can have varying degrees of severity.

Reference to the song "Hey You" by Pink Floyd. The line "and the worms ate into his brain" makes no sense in an otherwise linear and literal narration throughout the lyrics.

A hippopotamus and a bird breeding together, to produce a new species called 'Bippo' . Mentioned by the vine sensation Matthew Espinosa on Twitter March 5,2015.

omg omg omg bippos are the most amazing things in the world. they are so fricking crappy, its awesome. awesomest crappy thing in the world. you get them as a prize from this one magazine drive? if you sell like, a crap load of magazines? and they are like, this giant like fuzzy pom pom with googly eyes glued to it and little antenna made from pipe cleaners and littler pom poms and FEET. they have feet, too. and they are the lowest quality piece of junk EVER and i want one so BAAAADD because they are so fricking crappy that it like comes full circle and makes them AMAZING. AMAZINGNESS!!!!!! this definition has been brought to you by kayla.