hella Syllabification: (hell·a)Pronunciation: /ˈhelə/Entry from US Dictionary informalDefinition of hella adverb [as submodifier] extremely (used for emphasis):I was hella mad determiner a large amount or number of:those songs don’t get hella airplay there would be hella people in the streetsOrigin: 1980s: probably from helluva or hellacioushella in other Oxford dictionaries Definition of hella in the US English dictionary