Meaning

1 senses
  1. (slang)The prank of defecating in the cistern of a toilet, so that flushing the toilet brings in dirty water instead of clean.

Origin

From upper + deck + -er.

From upper + deck + -er.

Wiktionary, CC BY-SA 4.0 · source

Forms

plural: upper deckers
Singularupper decker
Pluralupper deckers

regular

See also

neighbours in the dictionary
upper decker — meaning, examples, forms, synonyms | Krumeto