O

  OCTAGONHEAD
  a double square person
  ". . . he knew she was an octagonhead, and he knew it would be the wrong thing to do."
  [ Bad-Rapping of the Marquis De Sade ]
       
  OFF FOR MOON CITY
  headed skyward
  ". . . and mother whammo, we're off for the moon city."
  [ Buckley Describes First Jet Ride ]
       
  OFF-PITCHED RAT STYLE
  denoting an irritating, atonal, high-pitched sound
  ". . . and even hung up the lady cats' backyard chats by topping their speakin' with screechin' and squeakin' off-pitched rat-style rhythm and blues that shook all the chicks right down to their shoes."
  [ The Swingin' Pied Piper ]
       
  ON HIS WAY OUT
  dying
  "The cat was on his way out."
  [ The Gasser ]
       
  ON THE HOOK
  dedicated or obligated
  "There is a couple of cats up on the hill that aren't on the hook for the Grail"
  [ Chastity Belt ]
       
  ON THE THEME OF THE BEAM OF THE INVISIBLE EDGE
  dying
  "He was on the theme of the beam of the invisible edge."
  [ The Gasser ]
       
  ONE MOTHER OF A TAKE-OFF
  the beginnings of a powerful LSD experience
  "My whole body was jingling with alert signals: 'This is going to be one mother of a take-off. Hang on!"
  [ Lord Buckley Describes His First lLSD Experience ]
 
  OXYGEN SNIFFER
  an oxygen mask
  "Next comes the oxygen sniffer."
  [ Buckley Describes First Jet Ride ]