This document summarizes 5 classic neologisms, or newly coined words and phrases, that were either invented by or refer to Dr. Seuss. They are: 1) "Dr. Suessinize it" which means to turn writing into a silly rhyming poem. 2) "Everything is so Cat in the Hat" which refers to a very chaotic situation. 3) "Nook" which describes a confused person. 4) "Nerd" which was used by Dr. Seuss to describe an unpleasant person. 5) "Crunk" which is both a music genre and means crazy and drunk.