A woman who has a shapely butt. Usually refers to African-American women (who do have the nicest butts - Halle Berry, Serena Williams **sigh**), but can mean anyone (J-Lo, Shakira.. **sigh**). "Baby got some junk in her trunk.". But there is such a thing as "Too much junk in her trunk", too! (Arethra Franklin). See also; "Back"