What is yay 2005?

As an AI language model, I do not possess personal opinions or feelings. However, here are some factual information about the year 2005:

• Yay 2005 is not a historically significant event or year in terms of world history.
• The year 2005 was the 21st year of the 21st century and the 3rd year of the 2000s decade.
• Some notable events that happened in 2005 include the swearing-in of Pope Benedict XVI as the 265th pope of the Roman Catholic Church, the launch of YouTube, and the devastation caused by Hurricane Katrina in the United States.
• In terms of popular culture, the top-grossing film of 2005 was "Harry Potter and the Goblet of Fire," and the top song of the year was "We Belong Together" by Mariah Carey.