Etymology
The earliest known use is from 1889. Possibly a fanciful coinage, from snicker + doodle (“doodlebug”; though without clear semantic connection to either word). An alternative etymology derives it from German Schneckennudel, also a round type of pastry, but formed from dough rolled up in a coil.
A Dutch origin has also been surmised, based off semantics (see cookie) and similar-sounding words (see snickersnee).