Definitions from Wiktionary (upper deck)

▸ noun:  (nautical) The topmost full-length deck of a ship.
▸ verb:  (slang, transitive) To perform the upper decker prank in the cistern of (a toilet).
▸ verb:  (slang, transitive) To place a snus or Zyn pouch under the upper lip.
▸ Also see upper_deck


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