crackerjack

Etymology 1
From.

Adjective

 * 1) Exceptionally fine or excellent; top-notch; high quality.
 * 2) Expert, top-rated or high-performing.

Noun

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

Etymology 2
From the trademark popcorn snack featuring a blue sailor-suited man on the box.

Noun

 * 1)  The traditional blue uniforms of the enlisted men of the US Navy.
 * 2)  A U.S. Navy sailor.
 * 3)  Popcorn candied in molasses-flavored caramel and peanuts.