A parodic holiday created in 1995 by John Baur (Ol’ Chumbucket) and Mark Summers (Cap’n Slappy), of Albany, Oregon,[1] U.S., who proclaimed September 19 each year as the day when everyone in the world should talk like a pirate.[2] An observer of this holiday would greet friends not with “Hello, everyone!” but with “Ahoy, maties!” or “Ahoy, me hearties!”. The holiday, and its observance, springs from a romanticized view of the Golden Age of Piracy.
Read more about it here: http://talklikeapirate.com/wordpress/sample-page/