means nobody or no one. It is a combination of kunoza and chiSaladhi, that is, Zimbaz who tend to use this slang term are those who always carry themselves in an exaggerated superficial manner. They are also the type of Zimbos who will pronounce the word photo as "fo-Dho".
And the type of Zimbos who will make a smooth transition from speaking Shona to speaking fluent English with unnecessary verbosity after polishing off a few glasses or more. They sure know themselves, don't they? My guess is they are probably reading this too, well, hello matey.