Exceptionally fine or excellent; top-notch; high quality. / Expert, top-rated or high-performing.

An exceptionally fine or excellent thing or person. / An expert or top-rated individual (e.g., a marksman).

(US, slang) Referring to clothing items (pants, jersey, collar) that constitute the traditional blue uniform of the enlisted men of the US Navy.

(US, slang, in the plural) The traditional blue uniforms of the enlisted men of the US Navy. / (US, slang) A U.S. Navy sailor.

plural of crackerjack