Noun
(US, historical) The alleged practice of comparing an African-American's skin color to that of a brown paper bag, allowing them certain privileges only if the skin was lighter.
Synonyms: brown paper bag test, paper bag test
(medicine) The practice of having a patient bring all of their existing medications to an appointment with the doctor, as a way to see what has previously been prescribed and what drug interactions might be occurring.
Source: en.wiktionary.org