an insect repellant. The term was coined in World War 2 and has been used since. In Vietnam, there was no shortage of bugs or 'bug juice', which was also used to light fires, clean weapons and heat cans of c-rations US, 1944.

Kool-Aid™ (a fruit drink made from a powder to which you add water), or a sugary, powdered, artificially flavoured Kool-Aid-like drink. Coined in World War 2, popular in Vietnam, and the title and subject of a rousing Girl Scout song sung to the tune of 'On Top of Old Smokey' US, 1946.

medication given to those with mental disorders US, 2002.

any antibiotic US, 1985.

an opiate or other depressant used as knock-out drops US, 1949.

cheap alcohol. Originally just meaning 'whisky' but, over time, less discerning US, 1863.

in aviation, propeller de-icing fluid. US Air Force use US, 1945.

tear gas US, 1950