upper decker

noun

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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Meanings

nounupper decker (plural upper deckers)

plural upper deckers

  1. slangThe prank of defecating in the cistern of a toilet, so that flushing the toilet brings in dirty water instead of clean.

    Should've bet on him doing an upper decker.

    2017, Molly E. Lee, Love in the Friend Zone
    1 more example

    Had he been doing “upper deckers” for years in his community?

    2014, John Waters, Role Models

Origin

From upper + deck + -er.

Full word history & related roots →
Cite this entry
APA

upper decker. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/upper%20decker

MLA

“upper decker.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/upper%20decker. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “upper decker,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/upper%20decker.

Source: upper decker on Wiktionary, CC BY-SA 4.0.