1. n. a very square person. This nerd was the most unbelievable cube you have ever seen.
2. n. a die, one of a pair of dice. (Usually in the plural.) She shook the cubes, saying, “Baby needs shoes!”
3. n. a sugar cube impregnated with LSD. (Drugs. Often in the plural.) First they took it on cubes. Then on little bits of paper.