What are the current useless terms in this "audio world"

Snake Oil... If it works for you, it's the greatest thing in the world. 
"Try it you'll like it"  (you older folks will remember this one although nothing to do with audio).

JS Smith, I think you forgot one... grainy.

  It use to be that an 18" subwoofer could not delineate the upper bass very good because it was to big (hence slow)-- it couldn't come back to it's starting point 'fast' enough to transduce the next note.
Because of that 'pitch definition' was lacking.  Seems fast is ok...