hot zone

Slang term for a toilet stall (or house bathroom) that has been temporarily rendered uninhabitable/unusable by a rank odor or other ‘residue’ resulting from recent usage. The etiquette, if you’re the perpetrator, is to warn a prospective user (on your way out) that he might want to select another stall (if there is more than one available). Creation of a ‘hot zone’ could possibly be averted by use of ‘the courtesy flush’ if one is having a particularly robust ‘movement’. Light a match, will’ya?