Cowboys loved a colorful phrase! To knock someone into a cocked hat meant to beat them senseless or to shock them completely. "You could have knocked me into a cocked hat when he showed up in that suit," said the cowboy.

According to Irish folklore, it's called a cocked hat.

You're probably looking for a Tricorn mate.

James Monroe was called the "last cocked hat" because he was the last U.S. president to wear a cocked hat, which was a style of hat popular in the late 18th and early 19th centuries. This nickname reflects the fact that Monroe's presidency marked the end of an era, as the fashion and style of the presidency evolved in the years following his administration.

http://us.i1.yimg.com/img.movies.Yahoo.com/ymv/us/img/Flickr/67/77/000503676777.jpg

^This guy is wearing a French cocked hat.

http://en.wikipedia.org/wiki/Cocked_hat

^Go there