As the stereotypical black person has a "booty," not too many white people have one. The word wooty is used to describe any white woman that does have one.
The word 'Wooty' is a term commonly used to racially provoke and describe a settlement of Cambodian people (named 'wootyians) in the Koh Hong region of Thailand and is seen to be an extremely racist and controversial word in Taiwanese society.