Originally a takeoff of Cliff Clavin, Cliff Redish or Cliff Raddish is just another dumb made-up joke name of a Cheers movie star.
See also:
Hot Lunch
Donkey Punch
Golden Shower
Pearl Necklace
Dog in a Bathtub
The Dirty Sanchez
Glass Bottom Boat
Jim went all 'cliff redish' on that girl.
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