Take a familiar proverb (a rolling stone gathers no moss), remove a phrase (rolling stone), insert an equally-familiar one (rolling pin), and what do you have? A malaproverb, that's what. Here's more.
Youngquist, Mary J. and Hazard, Harry W.
Word Ways: Vol. 8
, Article 18.
Available at: http://digitalcommons.butler.edu/wordways/vol8/iss4/18