coffee. Origin: the term refers to the Indonesian island of Java which was and is renowned for its coffee. It began to be used in the US in the late 1950's when Indonesia was exporting as a cash crop shortly after independence from the Netherlands (Holland).
Definitions include: Belgian flowers refers to a particularly subtle joke very specific to Belgium. A lot of Belgian florists are historically remembered as spreading those jokes with clients, and that is why through word of mouth those good words have become "Belgian Flowers"
Definitions include: mechanically inclined enthusiasts who as a hobby or past time like to work on cars, performance equipment such as hot rods or race equipment