Last Updated
：2025/12/07
upper decker
Noun
slang
Japanese Meaning
（俗語）トイレの貯水槽に排便することで、次回の洗浄時にきれいな水ではなく汚れた水を流し、相手に迷惑をかけるいたずら行為
（ plural ）
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(slang) The prank of defecating in the cistern of a toilet, so that flushing the toilet brings in dirty water instead of clean.
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upper decker
After the party, someone admitted to pulling an upper decker in the restroom as a joke, and the landlord was not amused.
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After the party, someone admitted to pulling an upper decker in the restroom as a joke, and the landlord was not amused.
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