When one has the habit of crushing those golden hollow Lindt Gold Bunnies, whenever one sees a display of the crazy expensivecritters. By simply pushing your thumbs into them, they implode really nicely.
Whenever Sheryl sees a display of those bunnies, she insists on bunny-crunching at least one or two.
Having sex without the proper lubrication, causing the woman complain.
This is a metaphor to the sound made by high performancemotorcycles that have a dry clutch system, which makes a humming, annoying sound when frequently applied.