Definition of "flap" []

• A flat, usually thin piece attached at only one side. (noun)
• A projecting or hanging piece usually intended to double over and protect or cover: the flap of an envelope. (noun)
• The act of waving or fluttering: the flap of the flag in the wind. (noun)
• The sound produced by this motion. (noun)
• A blow given with something flat; a slap. (noun)

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.

• "This flap is about the stupidist thing I have ever heard of."
• "Media Watch: My reaction to the minor, but loud, Miss USA/Miss Teen USA media flap is a personal indictment of the organization which "handles" these newly-minted celebrities."
• "T. Rex joins me and others in wondering what all the flap is about Mary Cheney; it's just hypocrisy, baby."