upper deck

noun, verb — 3 senses

upper deck

noun
1

Nautical, Transport The topmost full-length deck of a ship.

upper deck

verb
1

Slang To perform the upper decker prank in the cistern of (a toilet).

  • HOW DO I KNOW YOU'RE REALLY YOU AND NOT ANOTHER VOICE? YOU UPPER-DECKED THE TOILET BACK IN THE AVENGERS MANSION. I FEEL BAD ABOUT THAT, BUT I WAS MAD AT LOGAN.2014, Gerry Duggan, Brian Posehn, Deadpool Vol. 4: Deadpool vs S.H.I.E.L.D.:
  • I was angry at Cletus, then remembered the time in college when Sal and I picked the lock of Cletoid's bathroom door and took turns upper-decking his toilet. I smiled.2017, Jonathan LaPoma, Understanding the Alacrán:
2

Slang To place a snus or nicotine pouch under the upper lip.

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.