An act of love.

Carried out by the gentleman as he reaches the vinegar strokes. Said gentleman should be in position behind his lady, who herself should be positioned 'doggy' stylie.

The gentlman uses both hands to jab either side of the rib cage, thus inducing a satisfying tightening of the clunge.

It is best to avoid breaking the ribs as this could put the lady out of action for a short time.

Literally everyone, ever. Including the writer of this definition.