A louse (Pediculus humanus).
Any germ or contaminant, real or imagined, especially from the opposite gender (for pre-pubescent children).
A sideswiper, a type of telegraph key.
A nest-building female American coot (counterpart to cooter).
A small flying insect of the family Culicidae, the females of which bite humans and animals and suck blood, leaving an itching bump on the skin, and sometimes carrying diseases like malaria and yellow fever.
To fly close to the ground, seemingly without a course.