have ants in one\'s pants

any of numerous black, red, brown, or yellow social insects of the family Formicidae, of worldwide distribution especially in warm climates, having a large head with inner jaws for chewing and outer jaws for carrying and digging, and living in highly organized colonies containing wingless female workers, a winged queen, and, during breeding seasons, winged males, some species being noted for engaging in warfare, slavemaking, or the cultivation of food sources.