CRACKERJACK
jimdandy, jimhickey, crackerjack
(noun) something excellent of its kind; “the bike was a jimdandy”
jimdandy, jimhickey, crackerjack
(noun) someone excellent of their kind; “he’s a jimdandy of a soldier”
Source: WordNet® 3.1
Etymology 1
Adjective
crackerjack (comparative more crackerjack, superlative most crackerjack)
Exceptionally fine or excellent; top-notch; high quality.
Expert, top-rated or high-performing.
Noun
crackerjack (plural crackerjacks)
An exceptionally fine or excellent thing or person.
An expert or top-rated individual (e.g, a marksman).
Etymology 2
Adjective
crackerjack (not comparable)
(US, slang) Referring to clothing items (pants, jersey, collar) that constitute the traditional blue uniform of the enlisted men of the US Navy, following the sailor uniform worn by Sailor Jack on boxes of Cracker Jack snacks.
Noun
crackerjack (countable and uncountable, plural crackerjacks)
(US, slang, in the plural) The traditional blue uniforms of the enlisted men of the US Navy.
(US, slang) A U.S. Navy sailor.
(US, uncountable) Popcorn candied in molasses-flavored caramel and peanuts.
Source: Wiktionary