Meaning

noun English biochemist who determined the sequence of amino acids in insulin and who invented a technique to determine the genetic sequence of an organism (born in 1918)

noun United States nurse who campaigned for birth control and planned parenthood; she challenged Gregory Pincus to develop a birth control pill (1883-1966)

originAbbreviation of sandwich (pronounced sangwich) + -er (colloquialising suffix). Australian from 1960s.

Etymology from Wiktionary, CC BY-SA 3.0