crackerjack /ˈkɹækɚd͡ʒæk/adjective 3noun 4forms 3 adjective3 •Exceptionally fine or excellent; top-notch; high quality. •Expert, top-rated or high-performing. •(US, slang) Referring to clothing items (pants, jersey, collar) that constitute the traditional blue uniform of the enlisted men of the US Navy. noun4 •An exceptionally fine or excellent thing or person. •An expert or top-rated individual (e.g., a marksman). •(US, slang) A U.S. Navy sailor. •[in the plural] (US, slang) The traditional blue uniforms of the enlisted men of the US Navy. formscrackerjacks · more crackerjack · most crackerjack