Green’s Dictionary of Slang

1. excellent.

1900		in Randolph & Legman Ozark Folksongs and Folklore (1992) I 513: The French they are a funny race, / They fight with their feet / And fuck with their face – / Hinky-dinky parlay-voo?!
1913		E.L. Warnock ‘Terms of Approbation And Eulogy’ in DN IV:i 24: hinky-dinky. Excellent, first rate. [...] ‘Your work is hinky-dinky’.
1927		C. Sandburg Amer. Songbag 440: [title] Hinky Dinky, Parlee-Voo.

2. little, short in stature.

a.1910		‘The Honorable Hinky Dink Of Chicago’ at www.oldandsold.com 🌐 The Hinky Dink of the newspapers is, as a matter of fact, to a large extent fictitious. [...] The real Hinky Dink —otherwise Alderman Michael Kenna—is a very different person, for whatever may be said against him —and much is—he is a very real human being.
1951		N. Algren Chicago: City On the Make 26: By the time Hinky Dink Kenna came along.