Definition of "batty" [bat•ty]

• Slang Crazy; insane. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "One thing that always drives me batty is when the photos are so low resolution that they are worthless. jupiterthunder"
• "And then what drives me even more batty is when the room erupts in fervent applause, as if we are still living in the Cold War era, or as if they truly understand what socialized medicine would mean to them, and they are thoughtfully rejecting it for the principal of the free market."
• "There is more than one murder for Tori to cope with; but what drives her batty is the bulb on her porch keeps disappearing; her appointment book and a slide projector vanish."