slop-basin noun2 •(UK) A bowl for receiving the leavings of tea or coffee cups at table •(old-fashioned) A container used for urinating or defecating when it is impossible or inconvenient to go to a bathroom or toilet; a bedpan, a chamber pot. Commonly used in hospitals, where it is normally called bedpan. Formerly used in private residences, particularly those without an indoor toilet or bathroom. formsslop-basins