Which Doth Mock the Meat It Feeds on?

What does mock the meat it feeds on mean?

Meaning: jealousy. In "Othello," Iago describes jealousy as a monster which devours its source. "Oh, beware, my lord, of jealousy! It is the green-eyed monster which doth mock. The meat it feeds on" (Act 3, Scene 3).

What is Iago referring to when he says it is the green-eyed monster which doth mock the meat it feeds on?

So when he says "O beware, my lord, of jealousy; It is the green-eyed monster which doth mock the meet it feeds on," what he's actually saying is "I hope you become jealous and kill your wife, because that would, ironically, fulfill all my plans.