개털

Etymology
From.

Noun

 * 1) The fur of a dog.
 * 2)  Hair that is stiff, dry, tough.
 * 3)  Something that is worthless, useless, devoid of any monetary value or redeeming qualities.
 * 4)  Someone who is lowly regarded, of low social class and/or status, who is penniless, powerless, without money and/or influence.