upper decker

noun

noun

Etymology From upper + deck + -er.

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

Had he been doing “upper deckers” for years in his community?2014, John Waters, Role Models:
Should've bet on him doing an upper decker.2017, Molly E. Lee, Love in the Friend Zone:

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