rinky-dink (adj.) Look up rinky-dink at Dictionary.com
said to be early 20c. carnival slang and imitative of the sound of banjo music at parades, but early records suggest otherwise. The earliest senses seem to be as a noun, "maltreatment," especially robbery:
So I felt and saw that I was robbed and I went to look after an officer. I found an officer on the corner of Twenty-fifth street and Sixth avenue. I said, "Officer, I have got the rinky-dink." He knew what it meant all right. He said, "Where? Down at that wench house?" I said, "I guess that is right." [testimony dated New York August 9, 1899, published 1900]
And this chorus from the "Yale Literary Magazine," Feb. 1896:
Rinky dinky, rinky dink,
Stand him up for another drink.