What is the meaning of Chaff?

The inedible parts of a grain-producing plant.

Straw or hay cut up fine for the food of cattle.

Any excess or unwanted material, resource, or person; anything worthless.

Light jesting talk; banter; raillery.

Loose material, e.g. small strips of aluminum foil dropped from aircraft, intended to interfere with radar detection.

To use light, idle language by way of fun or ridicule; to banter.

To make fun of; to turn into ridicule by addressing in ironical or bantering language; to quiz.

To cut up (straw or hay) for use as cattle feed.

Alternative form of chaf

Source: wiktionary.org