A goblet or chalice that "pimps" carry around with them at social gatherings. Usually ridiculously decorated in a "sparkly" fashion. In fact, it looks like someone gave a kid with ADD infinite access to a "Bedazzler" and a china cabinet. Usually carries around "Cristal" (krih-stahl) immitations and such.
"That cup's spackled more with diamonds than my toilet with shit after I eat too mush Taco del Mar!"
"Word dawg, thass a Crunk Cup all up in dis."
"So that's what happened to my goddamn Bedazzler..."