a euphemism for cocaine in the presence of non users. Derived from frequent sightings of people at 4 hour lunches at public restaurants, during which they consume nothing but lemon-water and cigarettes, followed by sporadic trips to the B-room and more lemon-water.
"wanna meet up later? im in the mood for a lemonwater and a parliament"
Im not hungry ill just have a lemon-water thanks.