If it wasn't for the Muskateer citation my first reaction to hipped would have been that he had been so inundated with hipness and hip things, and the need to be hip, that he had bee "hipped to death", in a manner of speaking. Based on this definition of "hip".

>Main Entry: 4hip
Function: adjective
Inflected Form(s): hip·per; hip·pest
Etymology: alteration of 2hep
Date: 1904
: characterized by a keen informed awareness of or involvement in the newest developments or styles <