A form of
verbal riddle in which the
answer is a two-word phrase, both words
rhyming and having the same number of
syllables, and the
question is a
definition (often two
synonyms for the answer words).
For example:
Corpulent feline = fat cat
Keening sidekick = sobbin' Robin
The first example is properly called a hink-pink because it uses words of one syllable; two makes it a hinky-pinky, and three would make it a hinkety-pinkety.