There really is such an article as that?
Article 134 is known as the General Article or Catch all.
It has specifications or elements that must be proven, but it is used for criiminal activity that is not otherwise codified. It's primary use is to keep the UCMJ Current between revisions as new activity becomes illegal, such as "designer" drugs and Computer Crime.
The charge I quoted to him wasn't real, it was to try and get through his thick skull that he was being a dumba$$