Merriam-Webster has named "w00t" the word of the year for 2007. Although I've been using w00t! for years ~ I remember using it during my Everquest days, possibly as early as 2001 ~ apparently the movement in the English language towards texting and computer aided communication has brought this celebratory phrase to the forefront.
I own (or pwn) this shirt. It's sweet and now has a culturally significant word on it.
