The story
From poop (“the stern of a ship”) + deck. Unrelated to "poop" for feces.
Etymology from Wiktionary, CC BY-SA 4.0.
poop deck
Today it means: A high, exposed deck at the stern of a ship on top of the cabin(s). Full definition →
Today it means: A high, exposed deck at the stern of a ship on top of the cabin(s). Full definition →
From poop (“the stern of a ship”) + deck. Unrelated to "poop" for feces.
Etymology from Wiktionary, CC BY-SA 4.0.