Actually, in the same way that a broken clock is right twice a day, Sarah Palin has recently unwittingly (of course the only way she could) coined a pitch-perfect description of a group of shrill and disagreeable women; a "cackle."
As usual, of course, Palin misapplied it, to feminists. Of course, it instead describes the Michelle Bachmans, Ann Coulters, "Dr." Lauras, Nancy Graces and Sharron Angles --the all-American teahags perfectly.
In the same way that a group of lions is a called a "pride" and a group of ravens is an "unkindness," a group of screeching, brain-dead idiots with two x chromosomes apiece is a "cackle." Love it!